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Kerucut
s = 5 cm
D = 28 cm ---> r = 14 cm
Dit: L kerucut....?
L = πr ( r + s)
L = 22/7 x 14 (14 + 5)
L = 44 ( 19)
L = 836 cm²
22/7*14(14+5)
22*2*19
22*38
836 cm pngkat 2