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r = 21cm
L = phi × r × r
L = 22/7 × 21 × 21
L = 1386cm^
10. L = phi × r × r
1,54 = 22/7 × r^
1,54 × 7 : 22 = r^
0,49 = r^
akar dari 0,49 = r
0,7 = r
d= r×2
d = 0,7 × 2
d = 1,4cm
11. L1 = 1/2 × phi × r × r
L = 1/2 × 22/7 × 42 × 42
L = 2772cm^
L2 = 1/4 × phi × r × r
L = 1/4 × 22/7 × 42 × 42
L = 1386cm^
L seluruhny = L1 + L2
L = 2772 + 1386
L = 4158cm^
12. L = 1/4 × phi × r × r
L = 1/4 × 3,14 × 40 × 40
L = 1256cm^