Question

5. If the base area of a hemispherical solid is 1386 sq. metres, then find its
total surface area? Answer: 4158 sq.m
Geography - Unit...pptx​

Answer 1

Step-by-step explanation:

Hope this is helpful for you.

Answer 2

Answer:

Total surface area of hemisphere is 4158 sq.m.

Step-by-step explanation:

Given;

Base surface area of a hemisphere= 1386 sq. m.

Let r be the radius of hemisphere.

As we know that,

Base area of hemisphere= $\pi r^{2}$

                          1386 = (22/7 )  $r^{2}$

                            $r^{2}$= (1386 ×7)/22

                           $r^{2}$ = 63 × 7

                            r = 21 m.

AS we know that,

Total surface area of a hemisphere= 3$\pi r^{2}$

                                                          = 3× (22/7) × $21^{2}$

                                                          = 66 × 21×3

                                                          = 4,158 sq. m.