Question

assalamualaikum semua, tolong bantuin beserta cara pengerjaannya ya..​

Answer 1

Verified answer

a). Panjang busur PQ

[tex] \frac{ \alpha }{360} \times 2 \times \pi \times r \\ \frac{72}{180} \times 3,14 \times 20\\ 25,12 \: cm \\ \\ b).luas \: juring \: POQ \\ \frac{panjang \: busur \times r}{2} \\ \frac{25,12 \times 20}{2} \\ 251,2 \: {cm}^{2} [/tex]

Answer 2

a.) 25,12 cm

b.) 251,2 cm²

Penjelasan dengan langkah-langkah:

a.) Panjang busur

PB = a/360° × k lingkaran

PB = 72°/360° × 2 × 3,14 × 20

PB = 1/5 × 6,28 × 20

PB = 1 × 6,28 × 4

PB = 25,12 cm

b.) Luas juring:

LJ = a/360° × l lingkaran

LJ = 72°/360° × 3,14 × 20²

LJ = 1/5 × 3,14 × 400

LJ = 1 × 3,14 × 80

LJ = 251,2 cm²