Question

5. And the measure of angles marked '?' in each of the following.
Angle A =2x , angle B=3x , Angle C = 4x angle D = ?​

Answer 1

Answer:

Step-by-step explanation:

∠A+∠B+∠C= 180°

x+3x+y=180°

4x+y=180°

operating 3×4x+y-3y-5x=3×180-30°

12x+5x=540°-30°

17x=510°

x=30°

∠A=30

∴∠B=3x=3×30=90