Luas kerucut 200,96 cm & tinggi 15 cm. jika phi 3,14. hitunglah luas permukaan/sisi kerucut
5dregensleyer
Luas alas = π x r² 200,96 = 3,14 x r² 200,96/3,14 = r² 64 = r² √64 = r 8 = r sisi miring krucut ( s) s = √ 8² + 15² = √64 + 225 = √289 = 17 cm luas permukaan krucut Lp = Ls + ( π x r x s) = 200,96 + ( 3,14 x 8 x 15) = 200,96 + 376,8 = 577,76 cm²
200,96 = 3,14 x r²
200,96/3,14 = r²
64 = r²
√64 = r
8 = r
sisi miring krucut ( s)
s = √ 8² + 15²
= √64 + 225
= √289
= 17 cm
luas permukaan krucut
Lp = Ls + ( π x r x s)
= 200,96 + ( 3,14 x 8 x 15)
= 200,96 + 376,8
= 577,76 cm²