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A brief answer to primary school mathematics
36 regular pentagons can be divided into 5 3-angle and 1 regular pentagons.

The sum of the angles of the five triangular shapes is 180.

The sum of the internal angles of a regular Pentagon is180 * (n-2) =180 * 3 = 540; 540/5= 108 per hour.

The triangle is an isosceles triangle, and the base angle is the outer angle of the Pentagon, that is, the base angle = 180- 108=72.

The sum of the internal angles of the triangle is 180, so the vertex angle of the triangle, that is, the vertex angle of the five-pointed star = 180-72*2=36.