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