the sector of a circle has radius of 18 cm and central angle 135 o . find its perimeter ?
"perimeter of the sector = length of the arc + 2 ( radius ) = ( 135 / 360 * 2 * 22 / 7 * 18 ) + 2 ( 18 ) = 42.4 + 36 = 78.4 cm answer : a"
multiply(multiply(const_2, divide(multiply(subtract(18, const_3), const_2), add(const_4, const_3))), 18)