3) panjang busur = (α° / 360°) x 2 π r 7,85 = ( 22,5° / 360° ) 2 x 3,14 x r 7,85 = 0,39 x r r = 7,85 / 0,39 = 20 cm Luas lingkaran = π r² = 3,14 x 20² = 1.256 cm²
4) panjang busur = (α° / 360°) 2 π r 132 = (84° / 360°) 2 x 3,14 x r 132 = 1,466 x r r = 132 / 1,466 = 90, 04 cm
Luas lingkaran = π r² = 3,14 x 90,04² = 25.457,14 cm²
Verified answer
3) panjang busur = (α° / 360°) x 2 π r7,85 = ( 22,5° / 360° ) 2 x 3,14 x r
7,85 = 0,39 x r
r = 7,85 / 0,39
= 20 cm
Luas lingkaran = π r²
= 3,14 x 20²
= 1.256 cm²
4) panjang busur = (α° / 360°) 2 π r
132 = (84° / 360°) 2 x 3,14 x r
132 = 1,466 x r
r = 132 / 1,466
= 90, 04 cm
Luas lingkaran = π r²
= 3,14 x 90,04²
= 25.457,14 cm²