Question

Find the curved surface area, TSA, and volume of a cone whose height is 28cm and radius of base is 21cm.

Answer 1

As

Tsa of cone = pi×radius(slant height+radius)

And volume of cone =1/3pi×radius^2×height

Hope this helps

Answer 2

Given :

Height is 28cm and radius of base is 21cm

To find :

Find the curved surface area, TSA, and volume of a cone

Solution:

Height of cone = 28 cm

Radius of cone = 21 cm

Csa of cone = $\pi r \sqrt{h^2+r^2}= \frac{22}{7} \times 21 \times \sqrt{28^2+21^2}=2310 cm^2$

Tsa of cone = $\pi r \sqrt{h^2+r^2}+\pi r^2 =\frac{22}{7} \times 21 \times \sqrt{28^2+21^2}+ \frac{22}{7} (21)^2=3696 cm^2$

Volume of cone =$\frac{1}{3} \pi r^2 h = \frac{1}{3} \times \frac{22}{7} \times 21^2 \times 28 =12936 cm^3$