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# Unit 9 Geometry

### Triangles, Area, Volume

TermDefinition
Acute Angle angle smaller than 90 degrees
Acute Triangle a triangle with all acute angle
Adjacent Angle an angle next to another angle
Complementary Angles two angles that add up to 90 degrees
Congruent having the same measurements
Degree the measure of an angle
Equilateral Triangle a triangle with all three sides and angles are equal
Isosceles Triangle a triangle with two equal sides
Obtuse Angle angle larger than 90 degrees
Obtuse Triangle a triangle with one obtuse angle
Opposite Side Angle Theorem the largest angle is opposite the longest side, the smallest side is opposite the smallest angle, etc.
Right Angle angle measuring exactly 90 degrees
Right Triangle a triangle with one right angle
Scalene Triangle a triangle with no equal sides
Triangle Inequality Theorem two sides of a triangle, when added, have to be greater than the third side
Supplementary Angles two angles that add up to 180 degrees
Area the amount of space the shape covers; measured in square units
Base the bottom line of a 2D shape
Cube a 3D shape when all faces are the same size
Decompose to break down a shape into different shapes
Formula a mathematical rule that is written with symbols
Height how tall a shape is from the bottom to the top; has to be a straight line
Length how long a shape is from one side to the other
Line Segment a straight line from end point to end point; vertex to vertex
Parallelogram a shape with two pairs of parallel lines
Quadrilateral any shape with four sides
Rectangle a shape with four straight lines and four right angles
Rectangular Prism a 3D shape that has 6 faces, two of which are rectangles
Trapezoid a four sided shape that has only one pair of parallel sides
Width distance across from side to side
Vertex the point where two lines meet on a shape
Volume the amount of space an object takes up
Created by: kcrawford23