Answers

2016-03-15T22:40:38+05:30
Given that
CSA of the cone = 2310
r:l = 3:5
r/l = 3/5
3l = 5r  -------------------------(1)
CSA of cone = 2310
πrl = 2310
rl = 2310×7/22
rl = 735
l = 735/r --------------------(2)
from (1) and (2)
3(735/r) = 5r
2205/r = 5r
2205 = 5r²
r² = 441
r = 21 cm    (proved)
from (1)
3l = 5(21)
3l = 105
l = 35 cm   (proved)

we have on relation between r, h , l.
l = √r²+h²
then
h = √l²-r²
h = √ (35)² - (21)²
h = √1225 - 441
h = √784
h = 28 cm    (proved).
1 4 1