< juring 45°
r= 20 cm
a. p busur = 45°/360° x K lingkaran
=1/8 x (2 x 3,14 x 20 )
=1/8 ( 125,6 )
=15,7 cm
L juring = 1/8 x 3,14 x 20²
=1/8 x 3,14 x 400
=157 cm²
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< juring 45°
r= 20 cm
a. p busur = 45°/360° x K lingkaran
=1/8 x (2 x 3,14 x 20 )
=1/8 ( 125,6 )
=15,7 cm
L juring = 1/8 x 3,14 x 20²
=1/8 x 3,14 x 400
=157 cm²