1.

17. Solve for x.(9x 18)°

Answer»

The given figure is regular pentagon.

So, all angles must be equal.

We know sum of all angles in pentagon is 540°.

5 × ( 9x - 18°) = 540°

9x - 18° = 540°/5

9x - 18° = 108°

9x = 108° + 18°

9x = 126°

x = 126°/9

x = 14°

So, each angle is 9x - 18° = 9 ×14 - 18

= 108°

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