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Honors Geometry Midterm Exam Terms

Honors Geometry Midterm Exam - Chapter 1 Terms
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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