The area formula is related the size of the RADIUS of the circle
= π x 24 = 24 π = π x 122 = π x 144 = 144 π Examples: Find the area and circumference/perimeter of the following shapes. Leave your answers in terms of π. = π x 24 = 24 π = π x 122 = π x 144 = 144 π
= π x 11 = 11 π = π x 5.52 = π x 30.25 = 30.25 π
6 cm = π x 12 = 12 π = π x 62 = π x 36 = 36π This is a ¼ circle, so curved arc (÷4) Arc = 12 π ÷ 4 = 3π Perimeter = 3π + 12 + 12 = 3π + 24 This is a ¼ circle, so area (÷4) Area = 36π ÷ 4 = 9π