Luas 1
d = 2 × r
r = d ÷ 2
r = 21 ÷ 2
r = 10,5 cm
lingkaran dengan setengah bagian
L = ½ × π × r × r
L = ½ × 22/7 × 110,25
L = ½ × 2.425,5/7
L = ½ × 346,5
L = 173,25 cm²
Luas 2
L = s × s
L = 21 × 21
L = 441 cm²
luas gabungan :
luas
173,25 + 441 = 614,25 cm²
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Luas 1
d = 2 × r
r = d ÷ 2
r = 21 ÷ 2
r = 10,5 cm
lingkaran dengan setengah bagian
L = ½ × π × r × r
L = ½ × 22/7 × 110,25
L = ½ × 2.425,5/7
L = ½ × 346,5
L = 173,25 cm²
Luas 2
L = s × s
L = 21 × 21
L = 441 cm²
luas gabungan :
luas
173,25 + 441 = 614,25 cm²