Tolong dibantu ya kak

Tolong dibantu ya kak

Penjelasan dengan langkah-langkah:

luas :

3/4 O = 3/4 π r²

$frac{3}{4} times frac{22}{7} times 21 times 21 = 1039.5$

= 1.039,5 cm²

[] = s² = 21² = 441 cm²

total = 1.039,5 + 441 = 1.480,5 cm²

keliling :

3/4 O = 3/4 x π x d =

$frac{3}{4} times frac{22}{7} times 42 = 99$

= 99 cm

[] = 1/2 x s x 4

$frac{1}{2} times 21 times 4 = 42$

= 42 cm

total = 99 + 42 = 141 cm