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NUMBERS AND SHAPtS
B
A
C
ABC is a thirty dcgrcc angle.
ABC is an angle of thirty degrees.
AB is at an angle of thirty degrees to BC.
An angle orf 90* is a right angle.
An angle orf 180° is a straight angle.
An angle ®f 360® is a fuli angle.
An angle < 90° is an acute angle.
An angle > 90° but < 180° is an obtusc angle.
An angle >180® is called a reflex angle or an external angle.
NOUN ADJECTIVE
rectangle
rectangular
squarc
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#
triangular
circular scmicircular