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40 = 2r
20 = r
L = π . r²
= π . 20²
= 400π
2. L = π . r²
254,34 = 3,14 . r²
81 = r²
9 = r
3. r = 6400 km
K = π . 2. r
= 3,14 . 2 . 6400
= 40192 km
9. r = 84 m
K = π . 2. r
= 22/7 . 2 . 84
= 44 . 12
= 528 m
Biaya = K . 12500
= 528 . 12500
= Rp 6.600.000