Question

The radius of a hemisphere is 2r. Its total surface area is

Answer 1

Answer:

Given:

• Radius = 2r

To find: Total  Surface Area

Pre-requisite Knowledge :

       Total surface Area of hemisphere = 3πr²

Solution:

    r = 2r

    π = 22/7

substitute the values in it ,

$3\pi r^2\\\\\implies 3*\dfrac{22}{7}*(2r)^2 \\\\\implies 3*\dfrac{22}{7}*4r^2\\\\\implies \dfrac{264r^2}{7}\\\\or,\: 37.8r^2(approx)$

Thus, the total surface area of hemisphere is 37.8r² (approx)