Question

The sum of two angles of a triangle is 155°. Find the value of the third angle.

• A. ${155}^o$
• B. ${25}^o$
• C. ${55}^o$
• D. ${35}^o$

Answer 1

The correct option is B ${25}^o$

According to the angle sum property of a triangle, the sum of the measures of the three interior angles is 180°.

Sum of two given angles given = ${155}^o$

∴ Value of the third angle = ${180}^o$ – ${155}^o$ = ${25}^o$