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2) K = 2.π.r
= 2 x 3,14 x 20
= 125,6 (a)
3) r = d/2 = 28/2 = 14cm
L = π.r² = 22/7.14² = 22/7.196 = 616cm² (c)
4) dimisalkan apotema = x
x² = r² - (8/2)²
= 5² - 4²
= 25 - 16
= 9
x = √9
= 3 cm (c)