Answer :


A show - piece is made by mounting a hemisphere on cube

The Diameter of hemisphere is 5.2 cm.

Length of side of cube is 7 cm

Formula used/Theory.

Total surface area of Cube = 6 × side2

Curve surface area of Hemisphere = 2πr2

As we put hemisphere on Cube

The circle part of hemisphere will attach to cube 1 plane

TSA of show - piece is sum of CSA of hemisphere and TSA of cube subtracted by Area of circle of hemisphere

TSA of show - piece =

CSA of Hemisphere + TSA of cube–Area of circle

= 2πr2 + 6 × side2–πr2

= πr2 + 6 × side2

Diameter = 5.2 cm

Radius = = 2.6

TSA of show - piece = 3.14 × 2.6 × 2.6 + 6 × 7 × 7

= 21.22 + 294

= 315.22 cm2

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