Honors Geometry Midterm Exam Terms

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Honors Geometry Midterm Exam - Chapter 1 Terms

Acute Angle

An angle more than 0º but less than 90º

Adjacent Angles

Angles that share a common side and vertex

Angle Bisector

Ray that divides an angle in half

Circumference

A circle's perimeter

Collinear Points

Points on the same line

Complementary Angles

2 or more angles that add up to 90º

Coplanar Points

Points in the same plane

Diameter

A segment that passes through the center of a circle and the endpoints are on the circle

Hypotenuse

The side opposite the right angle (longest side)

Image

Resulting figure

Linear Pair

A pair of adjacent angles whose non common side forms a line

Midpoint

M; the point that cuts a segment in half

Obtuse Angle

An angle more than 90º but less than 180º

Preimage

Original figure

Radius

A segment whose endpoints are the center of the circle and a point on the circle

Reflection

(Flip) transformation across a line

Rotation

(Turn) transformation about a point

Straight Angle

An angle exactly 180º

Supplementary Angles

2 or more angles that add up to 180º

Transformation

A change in position, size, or shape of a figure

Translation

(Slide) transformation in which all the points of a figure move the same distance in the same direction

Vertex

Common endpoint

Vertical Angles

2 nonadjacent angles formed by 2 intersecting lines

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