the sector of a circle has radius of 28 cm and central angle 90 o . find its perimeter ?
"perimeter of the sector = length of the arc + 2 ( radius ) = ( 90 / 360 * 2 * 22 / 7 * 21 ) + 2 ( 28 ) = 44 + 56 = 100 cm answer : a"
multiply(multiply(const_2, divide(multiply(subtract(28, const_3), const_2), add(const_4, const_3))), 28)