Question

draw a triangle abc a=x+10 b=3x+5 x=2x+15​

Answer 1

Answer:

∠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