Question

A wooden article was made by scooping out a
hemisphere from each end of a cylinder, as shown in
the figure. If the height of the cylinder is 20 cm and its
base is of diameter 7 cm, find the total surface area of
the article when it is ready.
​

Answer 1

Step-by-step explanation:

the article made by it will be a sphere with the same radius as cone have...

since the total surface area of sphere is 4xpi×r^2

here,r =7/2cm. =3.5cm.

therefore area of sphere will be,

• 4×22/7×3.5×3.5
• 4×22/7×35/10×35/10
• 154

so, total surface area of the item formed will be 154 sq. cm.