Given.

A vessel is made by depressing hemisphere on cylinder

The radius of the hemisphere is 50 cm

Height of the cylinder is 150 cm

Formula used/Theory.

Curve surface area of Cylinder = 2πrh

Curve surface area of Hemisphere = 2πr2

As we put hemisphere in Cylinder

Area of bird - bath is sum of CSA of both hemisphere and cylinder

Area of Bird - bath = CSA of cylinder + CSA of Hemisphere

= 2πrh + 2πr2

= 2πr[h + r]

TSA of toy = 2 × 3.14 × 50 × [150 + 50]

= 2 × 3.14 × 50 × 

= 62800 cm2

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