how do you work this question out at the bottom? please help?????
how do you work this question out at the bottom? please help?????
Question Q1:
Surface area of the cone:
\(\pi r l + \pi r^{2}=125 \pi /: \pi
rl+ r^{2}=125
5l+ 5^{2}=125
5l+25=125
5l=100
l=100:5=20\)
Answer: l=20 cm.