Question 43

waecmaths question: 

In the diagram, what is x+ y in term of z ?

Option A: 

180oz

Option B: 

180o + z

Option C: 

z – 180o

Option D: 

z

waecmaths solution: 

$\begin{align}  & \vartriangle ABC \\ & \angle ACB=z\text{     }\!\!\{\!\!\text{ vertically opposite angles }\!\!\}\!\!\text{ } \\ & x+y+z={{180}^{\circ }}\text{   }\!\!\{\!\!\text{ sum of }\angle \text{s in a }\vartriangle \text{ }\!\!\}\!\!\text{ } \\ & x+y={{180}^{\circ }}-z \\\end{align}$

maths year: