Keliling alas kerucut 132 cm dan tingginya 17 cm Hitunglah luas permukaan

keliling alas
= 2πr = 132
2. 22/7. r = 132
44/7 .r = 132
r = 132 x 7/ 44
r = 924 / 44
r = 21 cm

s² = r² + t²
= 21² + 17²
= 441 + 289
s = √730 = 27,01 cm

Lp. kerucut = πr(r +s)
= 22/7. 21 (21 + 27,01)
= 22. 3 (48,01)
= 66 . 48,01
= 3168,66 cm²



Maaf ya kalo salah