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Kelas 8 MatematikaBab Lingkaran
** rumus hanya berlaku pada tembereng sudut 90° **
Luas yang diarsir
= 2 . luas tembereng
= 2 . 2/7 . r . r
= 4/7 . 7 . 7
= 28 cm²
Keliling yang diarsir
= 2 . 1/4 keliling lingkaran
= 1/2 . 2 . π . r
= 22/7 . 7
= 22 cm