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360 l.lingkaran
contoh :sebuah lingkaran berjari jari 7 cm sudut pusatnya 90 derjat,hitung luas juringnya
r = 7 cm
α =90 derajat
l.juring ?
90 = l.juring
360 22.7.7
7
1 = l.juring
4 154
l.juring = 154.1=38,5 cm
4
dit : luas juring?
jawab :
luas juring :
<pusat × πr²
360 derajat
72 × 22 × 14 × 14
360 7
72 × 616
360
123,2 cm²