Find the value of the unknown interior angle x in the following figures:

Explanation

(i) Exterior angle is `115^@`

Exterior angle = sum of interior opposite angles

`115^@ = x + 50^@`

`115^@ − 50^@ = x`

`x = 65^@`

(ii) Exterior angle is `100^@`
Exterior angle = sum of interior opposite angles

`100^@ = x + 70^@`

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