Question

plz solve this 16,17​

Answer 1

Answer:

(16) 1st angle = 2x

2nd angle = 3x

3rd angle = 4x

Sum of angles = 180°

2x + 3x + 4x = 180°

9x = 180°

x = 180° ÷ 9

x = 20°

Hence, 1st angle = 2x

= 2 × 20°

= 40°

2nd angle = 3x

= 3 × 20°

= 60°

3rd angle = 4x

= 4 × 20°

= 80°

(17) Perimeter = 72cm

1st side = 16 cm

2nd side = x

2 (x + 16) = 72

2x + 32 = 72

2x = 72 - 32

2x = 40

x = 40 ÷ 2

x = 20

Hence, the other side measures 20 cm.