In an ecosystem, the living organisms interact with each other for survival. Counting Numbers. This is written as A = (opposite)/(hypotenuse). This is written as cos A = (adjacent)/(hypotenuse). Acute Angle. Cramer’s Rule. Correlation Coefficient. A plane is a flat, two-dimensional object. B) Base, Basis, Bi-linear, Binomial, Bisect, Boundary, Box, Branch. The bases must be oriented identically. Isosceles Triangle. A midline is a segment that connects two consecutive midpoints of a triangle. Such polygons look like they have one or more angles caved in. Inverse Sine. Angles are measure in degrees. In a right angle triangle, the side of the triangle that is opposite to the right angle, is called the hypotenuse. 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. Critical Point. Hypotenuse. A transversal is a line that passes through (transverses) two other lines. A trapezoid is a quadrilateral that has one pair of opposite sides that are parallel. An acute triangle can be defined as a triangle where all the 3 angles that make up the triangle measure less than 90° each. Countably Infinite. The converse would be “If the sum of two numbers is even, then the numbers are even,” which is not a true statement. Geometry Vocabulary Word List (272) A) Acute, Adjacent, Advanced, Algebra, Alternate, Altitude, Analysis, Analyze, Angle, Apex, Application, Apply, Approximate, Arc, Architecture, Area, Assumption, Axiom, Axis. This point is equidistant from the three vertices of the triangle. Any polygon that has at least one angle that measure more than 180° is called a concave polygon. A point can be defined as having only location; it has no length, width, or depth. If angle A is an acute angle in a right angle triangle, the sine of A is the length of the side opposite to angle A, divided by the length of the hypotenuse of the triangle. CPCTC. Inverse Tangent: Isometry. Counterclockwise. Coordinate Plane. It can be defined by two intersecting lines or by three non-collinear points. A pond ecosystem is a freshwater ecosystem. An arc of a circle is a connected section of the circumference of a circle. It is drawn as an arrow. If the angle formed by the intersection of two lines is more than 90°, then the angle is known as obtuse angle. Cos-1. A square is a regular quadrilateral, or an object where all the four sides are equal. Sign up. An obtuse triangle is a triangle where at least one angle measures more than 90°. In this article, we have given you a list of the definitions of some of the basic terms used in geometry. Translation symmetry can be found only on an infinite strip. When three or more lines meet at a single point, they are said to be concurrent. The orthocenter of a triangle is the point where the three altitudes meet, making them concurrent. A Venn diagram uses circles to represent relationships among sets of objects. We'll assume you're ok with this, but you can opt-out if you wish. Coplanar. Get in touch with us and we'll talk... Geometry can be called a study of the shape, size, and position of objects. Law of Cosines. Beat your last streak, or best your overall time. A right angle triangle is a triangle where at least one angle measures 90°. No part of math is more confusing than geometry. (they are always the same distance apart) Right Angle. C) acute angle. Coterminal. Necessary cookies are absolutely essential for the website to function properly. 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. 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