Question

Find the value of the unknown. [2 MARKS]

(a)



(b)

Answer 1

Each part: 1 Mark each

(a) ${50}^{\circ }+x={115}^{\circ }$ (Exterior angle of a triangle is equal to the sum of its interior opposite angles)
$x={115}^{\circ }-{50}^{\circ }$
$x={65}^{\circ }$

(b) ${30}^{\circ }+x={80}^{\circ }$ (Exterior angle of a triangle is equal to the sum of its interior opposite angles)
$x={80}^{\circ }-{30}^{\circ }$
$x={50}^{\circ }$