We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
279
2
avatar

The area of the base of the cone is 81π square millimeters, and the area of the lateral surface is 135π square millimeters.Find the radius r and slant height ℓ of the cone.

 

r =  __mm

ℓ = ___ mm

 

 Sep 23, 2018
 #1
avatar
+1

Base area = Pi x r^2
81Pi =Pi x r^2
r =Sqrt(81) = 9 mm - the radius of the cone.
Lateral Surface Area=Pi x r x s
135Pi=Pi x 9 x s
s =135 / 9
s = 15 mm - slant height of the cone.

 Sep 24, 2018
 #2
avatar
0

Thanks 

Guest Sep 24, 2018

10 Online Users