Angles Answers

1. Y7_Angles_answer_01.gifABC, Y7_Angles_answer_01.gifABD and Y7_Angles_answer_01.gifDBC

2. a. Acute b. Reflex c. Acute d. Right e. Obtuse f. Straight

3. a. (i) 80o (ii) 130o (iii) 57o

b. (i) 60o (ii) 30o (iii) 89o

4.

a
 b =120o (Vert. opp. Y7_Angles_answer_01.gifs equal)
b
 d = 128o ( Adj. Y7_Angles_answer_01.gifs on st. line add up to 180°)
c
 m = 83o (Y7_Angles_answer_01.gifs at a pt. add to 360°) 
d

r = 58o
t = 122o 
s = 122o 
u = 45o

(Vert. opp. Y7_Angles_answer_01.gifs equal)
( Adj. Y7_Angles_answer_01.gifs on st. line add up to 180°)
(Vert. opp. Y7_Angles_answer_01.gifs equal)
( Adj. Y7_Angles_answer_01.gifs on st. line add up to 180°)
e

y = 40o
x = 140o
z = 140o

 (Vert. opp. Y7_Angles_answer_01.gifs equal)
( Adj. Y7_Angles_answer_01.gifs on st. line add up to 180°)
(Vert. opp. Y7_Angles_answer_01.gifs equal)
f
 p = 32o
n = 35o		 ( Adj. Y7_Angles_answer_01.gifs on st. line add up to 180°)
( Adj. Y7_Angles_answer_01.gifs on st. line add up to 180°)

Some answers can be arrived at in different ways.