Question

in ΔABC angle a=5x Degrees angle b=2x Degrees angle c= x Degrees, then angle b =?

Answer 1

we know that sum of all angles of a triangle is 180°

then,

angle a + angle b + angle c = 180°

5x + 2x + x = 180°

8x = 180°

x = 180/8

x = 22.5

b = 2x = 2 × 22.5

b = 45°