Question

If m$\angle$ $XYZ={86}^o$ and m$\angle$ $XZY={23}^o$. What is m$\angle$ $YXZ$ in the triangle?

• A. ${70}^o$
• B. ${71}^o$
• C. ${72}^o$
• D. ${73}^o$

Answer 1

The correct option is B ${71}^o$

By angle sum property, the sum of angles is ${180}^o$.

${86}^o+{23}^o+$ m$\angle$ $YXZ={180}^o$

m$\angle$ $YXZ={180}^o-{109}^o$
m$\angle$ $YXZ={71}^o$.