Question

Two Co-interior angles are ( X+30 )° and ( X+70)° then X = ______

a)40°

b)100°

c)60°

d)80°​

Answer 1

Answer:

a)40°

Step-by-step explanation:

$(x+30)(x+70)=180$  [co-int angles are supplementary]

$=>x+30+x+70=180\\\\=>2x+100=180\\\\=>2x=180-100=80\\\\=>x=\frac{80}{2}=40$