Honors Geometry Midterm Exam - Chapter 1 Terms

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Acute Angle

An angle more than 0º but less than 90º

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Adjacent Angles

Angles that share a common side and vertex

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Angle Bisector

Ray that divides an angle in half

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Circumference

A circle's perimeter

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Collinear Points

Points on the same line

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Complementary Angles

2 or more angles that add up to 90º

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Coplanar Points

Points in the same plane

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Diameter

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

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Hypotenuse

The side opposite the right angle (longest side)

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Linear Pair

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

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Midpoint

M; the point that cuts a segment in half

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Obtuse Angle

An angle more than 90º but less than 180º

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Radius

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

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Reflection

(Flip) transformation across a line

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Rotation

(Turn) transformation about a point

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Straight Angle

An angle exactly 180º

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Supplementary Angles

2 or more angles that add up to 180º

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Transformation

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

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Translation

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

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Vertical Angles

2 nonadjacent angles formed by 2 intersecting lines