calculate the area of a triangle , if the sides are 30 cm , 21 cm and 10 cm , what is its area ?
"the triangle with sides 30 cm , 21 cm and 10 cm is right angled , where the hypotenuse is 30 cm . area of the triangle = 1 / 2 * 21 * 10 = 105 cm 2 answer : b"
multiply(divide(21, const_2), 10)