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sebuah kerucut
diameter(d) = 10 cm
=> jari jari (r) = 1/2 x 10 cm
=> r = 5 cm
garis pelukis (s) = 13 cm
ditanya : luas seluruh sisi kerucut?
jawab:
luas seluruh sisi kerucut:
= πr (r + s)
= 3,14 x 5 cm (5 + 13) cm
= 15,7 cm (18 cm)
= 282,6 cm²
"maaf kalau ada yg salah"