7. Sebuah lingkaran memiliki keliling 6.280 cm. Hitunglah. berapa luas setengah lingkaran tersebut !
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Penjelasan dengan langkah-langkah:
Jari jari :
K = 2·π·r
6.280 = 2·3,14·r
6.280 = 6,28r
r = 6.280/6,28
r = 1.000 Cm
Luas setengah lingkaran :
= ½·π·r·r
= ½·3,14·1.000·1.000
= ½·3.140.000
= 1.570.000 Cm² = 157 m²
K = 2πr
6.280 = 2(3,14(r)
6.280 = 6,28r
6,28r = 6.280
r = 6.280/6,28
r = 1.000 CM
LP 1/2 Lingkaran :
= 1/2πr²
= 1/2(3,14(1.000)²
= 3,14/2(1.000(1.000)
= 3,14/2(1.000.000)
= 3,14(1.000.000)/2
= 3.140.000/2
= 1.570.000 cm²