Perhatikan gambar segitiga berikut tentukan luas daerah yang diarsir

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Diameter lingkaran sama dengan panjang garis tinggi segitiga, segitiga merupakan segitiga siku siku sehingga bisa menggunakan teorema pytahoras :

Sehingga diketahui diameter lingkaran adalah   dan jari-jarinya . Kemudian cari luas lingkaran karena lingkaran adalah daerah yang diarsir.

Jadi, luas daerah yang diarsir dari gambar adalah .