The given figure shows a circle with centre at o and angel AOB=90degree. If the radius the circle is 40c. m and pie=3.14; calculate the area of the unshaded portion of the circle

A circle is 360° in total, so the unsheded part should be 270 degrees. to calculate arc area, just calculate the circle area x 270/360, so here it'll be 40 square x pi x 270/360 so the answer is 3768 cm2