Answers
1)4/5 ×90= 360/5=72°
NOW LET WE SUBTRACT 72 WITH 180
180-72=108°
ANSWER= 108°
2) (i) 35° AQUTE ANGLE (ii) 185°REFLEX ANGLE (iii) 90° RIGHT ANGLE (iv) 92°OBTUSE ANGLE (v) 260° REFLEX ANGLE
3)AQUTE ANGLE
4)2/3 ×90=180/3 =60°
LET WE SUBTRACT 60 FROM 180
180-60=120°
ANSWER =120°
5) (a) ∠1 and ∠2 are not adjacent because they do not have a common arm.
(b) ∠1 and ∠2 are not adjacent because their interiors overlap.
(c) ∠1 and ∠2 are not adjacent because they do not have a common vertex.
(d) ∠1 and ∠2 are adjacent because they have a common arm, a common vertex and interiors do not overlap.
the rules that makes an angle adjacent are:-
(i) they have a common vertex,
(ii) they have a common arm and
(iii) the other arms of the two angles lie on opposite sides of the common arm.
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