The measure of an inscribed angle in a garden with five pointed star is 36 degrees so the angles in all five points sum to 180 degrees. According to the theorem, the measurement of an inscribed angle is twice the measurement of its intercepted arc. So twice 180 you'll get 360 which defines the whole measurement of a circle. 

Hope you get it. ☺
no... the angles of the each point have sum of 180 degree already.. therefore, the sum of the alll five points is 900
thanks po