Riya makes a pen stand: a cuboid 15 cm x 10 cm x 5 cm with a hemispherical depression (r = 3.5 cm) scooped from the top. Which expression gives the exposed area to be painted? (cuboid TSA minus top circle plus inner hemisphere curved area) (CSA = curved surface area, TSA = total surface area)

Question

Accepted Answer

TSA of cuboid - π*r^2 + 2*π*r^2. Remove the flat circle (π*r^2) of the depression and add the inner curved hemispherical wall (2*π*r^2).

Riya makes a pen stand: a cuboid 15 cm $x$ 10 cm $x$ 5 cm with a hemispherical depression $(r = 3.5$ cm) scooped from the top. Which expression gives the exposed area to be painted? (cuboid TSA minus top circle plus inner hemisphere curved area) (CSA = curved surface area, TSA = total surface area)

Step-by-Step Solution

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More Class 10 Surface Area of Combined Solids practice

Riya makes a pen stand: a cuboid 15 cm x 10 cm x 5 cm with a hemispherical depression (r=3.5 cm) scooped from the top. Which expression gives the exposed area to be painted? (cuboid TSA minus top circle plus inner hemisphere curved area) (CSA = curved surface area, TSA = total surface area)

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Surface Area of Combined Solids practice

Riya makes a pen stand: a cuboid 15 cm $x$ 10 cm $x$ 5 cm with a hemispherical depression $(r = 3.5$ cm) scooped from the top. Which expression gives the exposed area to be painted? (cuboid TSA minus top circle plus inner hemisphere curved area) (CSA = curved surface area, TSA = total surface area)