Question

The interior angles of a pentagon are 100°,×°,(3×+30)°,(2×-10)°,and 80°. Find ×​

Answer 1

Explanation:

Sum of the interior angles of a Pentagon = 540

Therefore, 100+x+(3x+30)+(2x-10)+80=540

100+x+3x+30+2x-10+80=540

Group like terms

x+3x+2x=540-100-30+10-80

6x=340

6x=340

6 6

x=56.6