Asked by Neema
An open right circular cone has a base radius of 5cm and perpendicular height of 12cm. Calculate the surface area of the cone (take π=3.142)
Answers
Answered by
Bot
The surface area of the cone is approximately 188.4 cm2.
Answered by
mathhelper
OH NO! The robot tutor messed this one up.
You need the slant height, not the perpendicular height to find SA
SA of cone = π r l
= π(5)(13) , did you recognize the 5-12-13 right-angled triangle?
= appr 204.2 cm^2
I did not include the surface area of the base of the cone
You need the slant height, not the perpendicular height to find SA
SA of cone = π r l
= π(5)(13) , did you recognize the 5-12-13 right-angled triangle?
= appr 204.2 cm^2
I did not include the surface area of the base of the cone