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The picture above shows a square, an equilateral triangle and a regular pentagon. Find the blue angle in degrees.

 

 Jul 4, 2020
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There are 360o around each point.

There are 60o in each vertex angle of an equilateral triangle.

There are 90o in each vertex angle of a square.

 

To find the number of degrees in each vertex angle of a regular pentagon, use this formula:

    degrees  =  (n - 2)·180o / n  (where n = number of sides)  =  (5 - 2)·180o​ / 5  =  108o.

 

360o - 60o - 90o - 108o  =  ..... 

 Jul 4, 2020

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