Converse means the “if” and “then” parts of a sentence are switched. An intersection with the horizontal axis is referred to as an x-intercept, and an intersection with the vertical axis is referred to as a y-intercept. This website uses cookies to improve your experience while you navigate through the website. A plane is a flat, two-dimensional object. An arc of a circle is a connected section of the circumference of a circle. A figure has rotation symmetry if you can rotate (or turn) that figure around a center point by fewer than 360° and the figure appears unchanged. No matter where you measure such lines, their perpendicular distance is always constant. Corresponding: cos. cos-1. Cos-1. For example, “If two numbers are both even, then their sum is even” is a true statement. This is written as A = (opposite)/(hypotenuse). The following article has a glossary list that will help you understand these difficult scientific terms and…. In a right angle triangle, the side of the triangle that is opposite to the right angle, is called the hypotenuse. Sign up. The incenter is equidistant from each of the three sides of the triangle. A face is a polygon by which a solid object is bound. cosecant. A pond ecosystem is a freshwater ecosystem. It continues forever in two directions (so it has infinite length), but it has no width at all. Interior Angle. in list order from A to Z from Z to A from easy to hard from hard to easy. It can be defined by two intersecting lines or by three non-collinear points. Start a Jam and invite your friends and classmates to join! But opting out of some of these cookies may have an effect on your browsing experience. A midline is a segment that connects two consecutive midpoints of a triangle. In a rotation, an object is turned about a “center” point, through a particular angle. For example, a cube has six faces, with each face being a square. An obtuse triangle is a triangle where at least one angle measures more than 90°. Cross Product. Once you are thorough with these basic terminologies, it is not difficult to understand the other terms and definitions in geometry. (updated May 7, 2012). It is considered to be difficult due to the many terms used in the subject, and also due to the fact that one has to understand the subject; it cannot be learned by rote. Two figures are said to be congruent if their corresponding lengths are the same, and the measure of their corresponding angles are same. Cramer’s Rule. Lateral Area. A vertex is the point where two sides of an object meet. We'll assume you're ok with this, but you can opt-out if you wish. Would you like to write for us? 6789 Quail Hill Pkwy, Suite 211 Irvine CA 92603. This website uses cookies to improve your experience. Correlation. The side-side-side (SSS) congruence states that if the three sides of one triangle have the same lengths as the three sides of another triangle, then the two triangles are congruent. If two pairs of adjacent sides in a quadrilateral have equal length, then it is called a kite. If A is an acute angle in a right angle triangle, then the cosine of A is defined as the length of the side adjacent to angle A, divided by the length of the hypotenuse of the triangle. Supplementary angles are two angles that add up to 180°. Necessary cookies are absolutely essential for the website to function properly. The part of a line that lies between two points is called a line segment. It should be noted that neither is this list for beginners, not is it for advanced students. Translation symmetry can be found only on an infinite strip. Countably Infinite. Whether you're a student, an educator, or a lifelong learner, can put you Read on to…, Science is a very vast subject that has innumerable words, terms, definitions, etc. … Inscribed Circle. Image of a Transformation. The midline theorem states that a midline of a triangle creates a segment that is parallel to the base and half as long. A line can be defined as having only one dimension: length. These cookies do not store any personal information. Translation is a rigid motion, meaning an object changes its position but not its size or shape. A regular polygon has sides that are all the same length and angles that all measure the same. The converse would be “If the sum of two numbers is even, then the numbers are even,” which is not a true statement. Counterexample. Just showing that an idea works in several cases is not enough to make an idea into a theorem. Interior. Any polygon that has at least one angle that measure more than 180° is called a concave polygon. A ray is a line that has a point on one end, and extends infinitely in the other direction. A central angle is defined as one which has its vertex at the center of a circle. (they are always the same distance apart) Right Angle. Inverse Tangent: Isometry. cot-1. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. The levels are (0) visualization, (1) analysis, (2) informal deduction, (3) deduction, and (4) rigor. Line segments that never intersect. An object is said to have line symmetry, or reflection symmetry, if it can be folded in half along a line so that the two halves match exactly. Rotation is a rigid motion, meaning an object changes its position but not its size or shape. Invariant. CPCTC. Don't have an account yet? A quadrilateral is a polygon with exactly four sides. How to say it: AY-lee-iss. A sector of a circle is a part of the interior of a circle bounded by two radii and an arc. We also use third-party cookies that help us analyze and understand how you use this website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. An angle whose vertex lies on the circle, and rays intersect the circle is called an inscribed angle. A right angle triangle is a triangle where at least one angle measures 90°. A design has symmetry if you can move the entire design by either rotation, reflection, or translation, and the design appears unchanged. An isosceles trapezoid is a quadrilateral with one pair of parallel sides and congruent base angles, or it is a trapezoid with congruent base angles. Congruent triangles are triangles that have the same size and shape. A prism is a solid that has parallel congruent bases which are both polygons. A parallelogram is a quadrilateral that has two pairs of opposite sides that are parallel. When three or more lines meet at a single point, they are said to be concurrent. A Venn diagram uses circles to represent relationships among sets of objects. cosec. Icosahedron. For translation symmetry, you can slide the whole strip some distance, and the pattern will land back on itself. In this article, we have given you a list of the definitions of some of the basic terms used in geometry. cot. Most of these terms can be confusing to students, and in addition to these terms, there are various theorems, laws, and definitions that have to be understood as well. Acute Angle. Parallel lines are two lines in the same plane that never intersect. A line connects two points via the shortest path, and then continues on in both directions. It is drawn as an arrow. Hypotenuse. The circumference of a circle is said to be the length of the boundary or the border of a circle. cosec-1. The orthocenter of a triangle is the point where the three altitudes meet, making them concurrent. If the angle formed by the intersection of two lines is more than 90°, then the angle is known as obtuse angle. The triangle inequality says that for three lengths to make a triangle, the sum of the lengths of any two sides must be greater than the third length. A theorem about right triangles must be true for every right triangle; there can be no exceptions. What it means: an assumed name taken on temporarily, sometimes … Counting Numbers. Lateral Surface Area. A point can be defined as having only location; it has no length, width, or depth. Angles are measure in degrees. Hyperbolic Geometry. Learn with flashcards, games, and more — for free. Sign up. The perpendicular bisector of a line segment is perpendicular to that segment and bisects it; that is, it goes through the midpoint of the segment, creating two equal segments. A segment that connects any vertex of a triangle to the midpoint of the opposite side is called a median.