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sudut ¼ lingkaran = 90°
Busur =90/360 2πr
11=1/4 x 2 x 22/7 r
11=11/7 r
r=11x7/11
r= 7 cm
Luas ¼ lingkaran
=¼ πr²
=¼ x 22/7 x 7 x 7
=¼ x 22 x 7
=38,5 cm²