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Verified answer
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Verified answer
Dik :> keliling tutup yg berbentuk lingkaran = 15,7 cm
dit : luas permukaan?
jawab :
cari terlebih dahulu jari2nya menggunakan rumus keliling lingkaran..
K. lingkaran = 2×Π×r
r = K. lingkaran / 2×Π
r = 15,7 cm / 2×22/7
r = 15,7×7 / 2×22
r = 109,9 / 44
r = 2,49 (dibulatkan)
r = 2,5 cm
L. lingkaran = Π×r^2
= 3,14× 2,5^2
= 3,14× 6,25
= 19,625 cm^2
Semoga benar dan dapat membantu ya ^_^…