calculate the lateral surface area (that is, no bottom) (in in^2) of a cone with a diameter of 24 in. and a slant height of 48 in.(nearest tenth)
You will find the formula here
https://www.google.com.au/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=formula%20for%20lateral%20area%20of%20a%20cone
I just googled to find this - you could have done the same.
