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Question

In an equiangular polygon, the measure of each exterior angle is 25% of the measure of each interior angle. How many sides it has?

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Solution

The sum of exterior angle and its adjacent interior is 1800, that is,

e+i=1800

Since each exterior angle is 25% of the measure of each interior angle, therefore, substitute 25100i=e or i=4e.

e+4e=18005e=1800e=18005=360

We know that the measure of exterior angle is e=(360n)0 where n is the number of sides.

Here, it is given that the exterior angle is e=360, therefore,

n=360e=36036=10

Hence, the number of sides is 10.

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