Question

In ∆RST, m∠R = 70° and m∠S = 30°. Find m∠T.

Answer 1

It is given that m∠R = 70° and m∠S = 30°.
Using angle sum property of ∆RST,
m∠R + m∠S + m∠T = 180°
70° + 30° + m∠T = 180°
100° + m∠T = 180°
m∠T = 180° – 100°
⇒ m∠T = 80°
Thus, ∠T = 80°.