Luas selimut kerucut yg keliling alasnya 72,36 cm, tinggi 16 cn, dan pendekatan phi = 3,14 adalah
IndahRadhiyah
Keliling alas = 2 phi r 72,36 = 2 x 3,14 xr 72,36 = 6,28 x r 72,36 / 6, 28 = r r = 11 , 5 s^ = 16 x 16 + 11,5 x 11, 5 = 265 + 132.25 s = akar kuadrat 397,25 s = 19,93 luas selimut kerucut = phi x r x s = 3,14 x 11,5 x 19,93 = 719,6723 cm
72,36 = 2 x 3,14 xr
72,36 = 6,28 x r
72,36 / 6, 28 = r
r = 11 , 5
s^ = 16 x 16 + 11,5 x 11, 5
= 265 + 132.25
s = akar kuadrat 397,25
s = 19,93
luas selimut kerucut = phi x r x s
= 3,14 x 11,5 x 19,93
= 719,6723 cm