Question

find x A=?,B=3x-6, C=56 and D=80

Answer 1

Answer:

45 I think so

sososososo

Answer 2

∠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

HENCE IT IS A RIGHT ANGLE