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Diameter : 7 × 3 = 21 cm
Jari jari : 21 : 2 = 10,5
Luas :
= 22/7 × 10,5 × 10,5
= 22 × 1,5 × 10,5
= 346,5 cm2
-Luas lingkaran AB
Diameter : 14
Jari jari : 14 : 2 = 7
Luas :
= 22/7 × 7 × 7
= 22 × 7
= 154 cm2
-Luas lingkaran bc
Diameter : 7
Jari jari : 7 : 2 = 3,5
Luas :
= 22/7 × 3,5 × 3,5
= 22 × 0,5 × 3,5
= 38,5 cm2
-Luas yang diarsir
= 346,5 - 154 - 38,5
= 154 cm2
maaf kalau salah...