Question

Find the value of x and y
(a) x = 20 , y = 130
(b) x = 40 , y = 140
(c) x = 20 , y = 140
(d) x = 15 , y = 140​

Answer 1

Explanation:

3x° + 4x° + 40° = 180° [ Angle sum property]

7x° + 40° = 180°

7x° = 180° - 40°

7x° = 140°

x = 140 / 7

x = 20°

Angle A = 4x° = 4 X 20

= 80°

Angle B = 3x° = 3 X 20

= 60°

Angle y + 40° = 180° [Linear pair ]

Angle y = 180° - 40°

Angle y = 140°