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132cm=2×22/7×r
r=132cm / 44/7
r=21cm
L=πr²
L=22/7×(21cm)²
L=22/7×441cm²
L=1386cm²
C
8.L=πr²
1386m²=π×r²
r=√1386m² / 22/7
r=√441 m²
r=21 m
K=2πr
K=2×22/7×21m
K=132 m
Banyak pohon=132m/4×33 pohon
B
L = × 21 × 21 cm² = 1386 cm²