Question

Find the missing angle in the following figure.

• A. ${170}^{\circ }$
• B. ${135}^{\circ }$
• C. ${140}^{\circ }$
• D. ${160}^{\circ }$

Answer 1

The correct option is B ${135}^{\circ }$

${15}^{\circ }+{30}^{\circ }+x={180}^{\circ }$
${45}^{\circ }+x={180}^{\circ }$
$x={180}^{\circ }-{45}^{\circ }$
$x={135}^{\circ }$