A straight angle is = _____ right angles.
Right angle + Right angle = Straight angle
2×Right angle = Straight angle
2×90°=180°
Hence, two right angles make 180° .
A straight angle is equal to ___ right angle(s).
The number of right angles in a straight angle is ______ and in a complete angle is ________.
What is the measure of (i) a right angle? (ii) a straight angle?