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132 = 2 × 22/7 × r
132×7 = 44 r
924 = r
924/44= r
21 = r
Luas Lingkaran
= πr²
= 22/7 × 21²
= 1386 cm²
Keliling : 132 cm
Ditanya : Luas lingkaran
Jawab
Keliling = 2πr
132 = 2 x 22/7 x r
132 = 44/7 x r
132 x7/44 = r
924/44 = r
21 = r = jari-jari
Luas lingkaran :
πr²
22/7 x 21 x 21
1386 cm²
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