Bantu jawabin dong ……

Bantu jawabin dong ……

Jawaban:

B. 462 cm

Penjelasan dengan langkah-langkah:

L = 22/7 × 21 × 21 × 1/3

= 1386 × 1/3

= 462 cm²

$luas = frac{120}{360} times pi times r {}^{2} \ = frac{1}{3} times frac{22}{7} times 21 {}^{2} \ = frac{1}{3} times frac{22}{7} times 441 \ = 462cm {}^{2}$