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LINGKARAN - Raphael

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Contoh 2<br />

Diketahui sebuah lingkaran dengan pusat O dan<br />

jari-jari 15 cm. Sudut pusat AOB besarnya 90 o .<br />

Tentukan luas tembereng AB.<br />

Penyelesaian:<br />

Luas tembereng AB = luas juring AOB – luas<br />

segitiga AOB<br />

= ¼ π r 2 – ½ r 2<br />

= ¼ x 3,14 x 15 2 – ½ x 15 2<br />

= 64,125 cm 2

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