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K : K2
= πd : πD
= d : D
= 10 : 30 = 1 : 3
4. b.
L1 : L2
= πr² : πR²
= r² : R²
= 5² : 15²
= 25 : 225
= 1 : 9
5. luas tembereng
= luas juring - luas segitiga
= 90/360 x πr² - 1/2 x a x t
= 1/4 x 22/7 x 14² - 1/2 x 14 x 14
= (1/2 x 11 x 2 x 14) - (7 x 14)
= 154 - 98
= 56 cm²
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