diketahui : L = 616 cm²
ditanya : K?
mencari jari jari:
L = phi × r²
r² = L/phi
r² = 616 ÷ 22/7
r² = 616 × 7/22
r² = 28 × 7
r² = 196
r = √196
r = 14 cm
K = 2 × π × r
K = 2 × 22/7 × 14
K = 2 × 22 × 2
K = 44 × 2
K = 88 cm
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diketahui : L = 616 cm²
ditanya : K?
Rumus kelilingnya: K = 2 × phi × r
mencari jari jari:
L = phi × r²
r² = L/phi
r² = 616 ÷ 22/7
r² = 616 × 7/22
r² = 28 × 7
r² = 196
r = √196
r = 14 cm
keliling:
K = 2 × π × r
K = 2 × 22/7 × 14
K = 2 × 22 × 2
K = 44 × 2
K = 88 cm
keliling = 88 cm
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