Pada lingkaran yg berpusat pada titik O.
Jika jari jari lingkaran 8 cm dan
Jika jari jari lingkaran 8 cm dan
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= (90/360 x pi x r^2) - (a x t x 1/2)
= (1/4 x 3,14 x 8 x 8) - (8 x 8 x 1/2)
= 50,24 - 32
= 18,24 cm