Function to calculate the length of diagonals of a rhombus using length of sides and vertex angle
function Length_Diagonals ( a , theta ) { let p = a * Math . sqrt ( 2 + ( 2 * Math . cos ( theta * ( Math . PI / 180 ) ) ) ) ; let q = a * Math . sqrt ( 2 - ( 2 * Math . cos ( theta * ( Math . PI / 180 ) ) ) ) ; return [ p , q ] ; }