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Angles
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A point where two or more lines meet
vertex
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An instrument to measure angles
protractor
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A figure formed by two rays
angle
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An angle of more than 90° and less than 180°
obtuse angle
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An angle of 180°
straight angle
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Equal size angles across a vertex
Vertically Opposite Angles
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What is a ray?
Part of a line that has a fixed starting point but no end point.
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360°
a full turn
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Two angles that form a straight line.
Supplementary angles
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A quarter turn angle is a (n)...
right angle
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An angle is a measure of
turn
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An angle of 90°
right angle
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An angle of less than 90°
acute angle
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What is a complementary angle?
Two angles that form a right angle
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An angle of more than 180 and less than 360°
reflex angle
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