waecmaths question:
In the diagram, what is x+ y in term of z ?
Option A:
180o- z
Option B:
180o + z
Option C:
z – 180o
Option D:
z
waecmaths solution:
$\begin{align} & \vartriangle ABC \\ & \angle ACB=z\text{ }\!\!\{\!\!\text{ vertically opposite angles }\!\!\}\!\!\text{ } \\ & x+y+z={{180}^{\circ }}\text{ }\!\!\{\!\!\text{ sum of }\angle \text{s in a }\vartriangle \text{ }\!\!\}\!\!\text{ } \\ & x+y={{180}^{\circ }}-z \\\end{align}$
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