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Geometry

Terms in this set (20)

Right Angle
an angle that measures 90 degrees
acute angle
An angle that measures greater than 0 and less than 90 degrees.
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
straight angle
an angle that measures 180 degrees
protractor
A tool used to measure angles
vertex
The common endpoint of an angle
equalateral triangle
a triangle with all equal sides
obtuse triangle
a triangle with one obtuse angle
scalene triangle
a triangle with no congruent sides
isosceles triangle
a triangle with two equal sides
acute triangle
A triangle with 3 acute angles
right triangle
a triangle with one right angle
congruent
Having the same size and shape
translation
Sliding all the points of a shape according to given directions (up/down, right / left)
rotation
spinning of a shape
reflection
The mirror image produced by flipping a figure over a line
Radius
A straight line from the center to the circumference of a circle or sphere.
diameter
A straight line passing from side to side through the center of a circle or sphere.
chord
A segment whose endpoints lie on a circle
circumference
The distance around a circle (the perimeter of a circle)
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