Carilah keliling dan luas lingkaran yang jari jarinya 7

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Carilah keliling dan luas lingkaran yang jari jarinya 7

Jawaban :

L = 154 cm²

K = 44 cm

Penyelesaian :

L = π × r²

L = 22/7 × ( 7 × 7 )

L = 22/7 × 49

L = 154 ✔

—

K = 2 × π × r

K = 2 × 22/7 × 7

K = 2 × 22

K = 44 ✔

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Jawaban :

Luas = 154 cm²

Keliling = 44 cm

Langkah penyelesaian :

L = π × r²

L = frac{22}{7} times 7^{2}

L = frac{22}{7} times 49

L = 22 times 7

L = 154 cm^{2}

_______________________________

K = π × 2r

K = frac{22}{7} times 2(7)

K = frac{22}{7} times 14

K = 22 times 2

k = 44 cm

Keterangan :

Materi = Bangun Datar