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= s x s - 1/2 pi . r^2
jika d = s, maka r = 1/2 s. shg rumusnya menjadi
= s x s - 1/2 pi .(1/2 s)^2
= s x s - 1/2 pi . 1/4 s ^2
maaf klo salah, semoga membantu ^^ semangat belajar~!