An open cone has a slant height of 5cm and a cuved surface area of 251cm square .Find the radius of its circular base leaving your answer correct to 3 significant figures

Question

An open cone has a slant height of 5cm and a cuved surface area of 251cm square .Find the radius of its circular base leaving your answer correct  to 3 significant figures

anonymous · Answer

$$CSA = \pi \times r \times l$$
where r is the radius and l is the slant height.
$$r=251\div (\pi \times 5)$$
=15.9876 cm.

anonymous · Answer

no u r wrong

directrix · Answer

The area of the curved (lateral) surface of a cone = πrL where r is the base radius, and L and L is the slant height.

251 = pi*r*5
251 = 3.1415 * r * 5
251= 15.7075 * r
r =        ----------> @JudeSharp009 

Although you said @NeetziD answer is wrong, I think you can get the same result when you divide.  Don't forget this:  leaving your answer correct  to 3 significant figures