Find ‘x’ in the following figures?

Given: In Δ ABC, m∠ A = 25°, m∠ B = x° and m∠ C = 30°

In Δ ABC,

m∠ A + m∠ B + m∠ C = 180° (Sum of the measures of all

angles of a triangle is 180°)

⇒ 25° + x° + 30° = 180°

x + 55 = 180

⇒ x = 180 – 55 (Transposing 55 to RHS)

x = 125

∴ The value of x is 125°.