text: Side of a regular n | Function to calculate the side of the polygon circumscribed in a circle ; Total sides of the polygon ; Radius of the circumscribing circle
code: < ? php function calculateSide ( $ n , $ r ) { $ theta ; $ theta_in_radians ; $ theta = 360 / $ n ; $ theta_in_radians = $ theta * 3.14 / 180 ; return 2 * $ r * sin ( $ theta_in_radians / 2 ) ; } $ n = 3 ; $ r = 5 ; echo calculateSide ( $ n , $ r ) ; ? >