Hitung luas tembereng AB jika OA = 7 cm! (lihat gambar)

Hitung luas tembereng AB jika OA = 7 cm! (lihat gambar)

Luas juring=

$frac{90}{360} times pi {r}^{2} = \ frac{1}{4} times frac{22}{7} times {7}^{2} = \ frac{1}{4} times 22 times 7 = \ frac{1}{4} times 154 = 38.5 : {cm}^{2}$

Luas segitiga AOB=

$frac{1}{2} times a times t = \ frac{1}{2} times 7 times 7 = \ frac{1}{2} times 49 = 24.5 : {cm}^{2}$

Luas tembereng AB=

Luas juring-Luas segitiga AOB°

38,5-24,5=14 cm²

Terima kasih.