Question

If two angles in a triangle are 55${}^{\circ }$ and 45${}^{\circ }$, then what would be the third angle?

• A. 75${}^{\circ }$
• B. 80${}^{\circ }$
• C. 85${}^{\circ }$
• D. 120${}^{\circ }$

Answer 1

The correct option is B

80${}^{\circ }$

Given that two angles are 55${}^{\circ }$ and 45${}^{\circ }$

The sum of angles of a triangle is 180${}^{\circ }$.

So, third angle = 180 - (55 + 45) = 180 - 100 = 80${}^{\circ }$