# Geometry

## 33 terms · College Geometry

### circle

is the set of all points in a plane at a given distance
(center)in the plane

### sphere

a whole circle with no side or angles

### supplementary

two angles that has the measure of 180 degrees

### complementary

two angles that have the measure of 90 degrees

### trapezoid

a ploygon is a trapezoid if and only if its a quad with two parallel sides

### rhombus

a quadirlateral is arhombus if and only if its an equilateral parallelogram

### parallelogram

a polygon is a parallelogram if and only if its a quadirlateral with two pair of parallel sides

### square

a quadirlateral is a square if and only if all sides are equal and all internal angles are congruent

### rectangle

a quadirlateral is a rectangle if and only if it has parallel sides equal angles

### scalene riangles

a triangle with no congruent sides

### equilateral triangle

a triangle whose sides are all congruent

### isoscelese tirangles

a triangle that has at least two equal sides

### hypotenuse

the side of a right triangle opposite the right angle

### sine

ratio of the opposite side to the hypotenuse of a right-angled triangle

### cosine

ratio of the adjacent side to the hypotenuse of a right-angled triangle

### tangent

ratio of the opposite to the adjacent side of a right-angled triangle

### collinear

points that are on the same line

### diagonal

of a polygon is a line segment that connects two non consecutive vertices

### similar

resembling or similar

### congruent

figures with the same shape and size same measure

### midpoint

point on a line segment that forms two congruent line segments

### median

the 3 medians of a triangle in tersect at exactly one point called centroial

### centroid

the point of concurrency of the medians of a triangle

### regular polygons

a polygon that is both equilateral and equiangular

### minor arc

is an arc of a circle that is smaller than a semicircle

### major arc

is an arc of a circle that is larger than a semicircle

### ratio

the relative magnitudes of two quantities (usually expressed as a quotient)

### proportion

harmonious arrangement or relation of parts or elements within a whole (as in a design)

### volume

the amount of space an object takes up

### area

the number of square units that fit inside a 2-D figture

### chord

a line segment inside of the circle with the endpoints on the circle

### secant

a line that intersects a circle in 2 points

### tangent to a circle

a line, segment, or ray in the plane of a circle that intersects the circle in exactly one point