Question

Pls help solve these

Answer 1

9.i.

x + 2x+5 + 4x + 3x+5 = 360°

10x + 10 =360°

10x = 350

x = 35°

ii.

x + 90° + x + 25 + 60 + 3x - 15 = 360

5x + 160 = 360

5x = 200

x = 40°

10.i.

2x + 10 + 3x -10 + 40 = 180

5x +40 = 180

5x = 140

x = 35°

ii.

28 + 36 + 90 + x =180

x = 180 - 154

x = 26°

11.

i. 45 + y + 70 = 180

y = 180 - 115 = 65°

ii. 35 + 2x + z = 180

35 + 70 + z = 180

z = 180 - 105 = 75°

iii.

3:5:7

divide 180 by sum of the ratio,

180/(7+5+3)

= 180/15

= 12

now , x = 3×12=36°

y = 5×12 = 60°

z = 7×12 = 84°