Question

Find the unknown marked angles in the given figures.

Answer 1

Step: Find value of x

We know, the exterior angle of a triangle is equal to the sum of two interior opposite angles of the triangle.

${110}^{\circ }$ = ${30}^{\circ }$ + $x^{\circ }$

⇒ $x^{\circ }$ = ${110}^{\circ }$ - ${30}^{\circ }$

= ${80}^{\circ }$

Hence, the unknown angle x is ${80}^{\circ }$.