Tolong dibnatu ya kak

Luas juring AOB
= 45/360. (πr^2)
= 1/8. (3,14.100
=1/8.314
=39,25 cm^2 (b)

Diketahui:
OA = jari-jari (r) = 10 cm
AOB = 45°

Ditanya:
L juring AOB = ?

Jawab:
L lingkaran = π x r x r
= 3,14 x 10 x 10
= 3,14 × 100
= 314

L juring AOB = 45°/360° x L lingkaran

= 1/8 x 314
= 39,25 cm^2

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