Question

Two solid hemispherical objects are of same shape and size and each of them has the
total surface area 462 cm. Find the total surface area of the sphere formed by combining the two hemispherical objects.​

Answer 1

Answer:

616cm²

Step-by-step explanation:

The total surface area of a hemisphere = 3 pie r²

As per the question 3pie r²=462cm²

pie r²=154

r²=154×7/22

=49

r=7

There for radius =7cm

Total surface area of two combined hemispheres

(now the shape will be sphere)

=2(3pie r²)-2(pie r²)

=6pie r²-2pie r²

=4pie r²

=4×22/7×7²

=4×22×7

=616cm²