Question

the radius of sphere is r cm. it is divided into 2 equal parts. find the whole surface area of the 2 parts

Answer 1

Answer:

So it is divided into two equal hemisphere

Step-by-step explanation:

Whole surface area of two equal hemisphere = 2×(3πr²)

                                                                            = 2×(3×22/7 ×r²)

                                                                            =132/7 r²

                                                                            = 18.85r²  cm²