Question

Find the value of the unknown interior angle x in the following figures. [1 mark]

Answer 1

Since, Exterior angle = Sum of interior opposite angles, therefore,

$x+{90}^{\circ }={125}^{\circ }$ or,
[0.5 marks]

$x={125}^{\circ }-{90}^{\circ }$

$\Rightarrow {125}^{\circ }-{90}^{\circ }={35}^{\circ }$

$\Rightarrow x={35}^{\circ }$
[0.5 marks]