Page 31 - Math G4 (second term) booklet_Neat
P. 31
Date:…../……./202 H.W: C.W: Absent:
unit(13) lesson (1) The circle and the Degrees
Angles in a circle can be classified by their measurement
Acute angles Right angle Obtuse angle Straight
Exactly 90 , 1 Between 90 Ο angle Exactly
Ο
Between 0 and 4 Ο 180 , of a
Ο
1
Ο
90 Ο of a full and 180 2
rotation . full rotation
Notes
a) Circle can be divided into 4 right angles or two straight angles ,
each circle has 360 Ο .
b) The right angle = of the circle.
c) The straight angle = of the circle.
d) There are two directions they can go on a circle clockwise or
counterclockwise ( anticlockwise)
e) 0 is the starting point.
Ο
f) Full rotation makes 360 Ο
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