Find the area of metal sheet required in making a closed hollow cone o

1.	Find the area of metal sheet required in making a closed hollow cone of base radius 7 cm and height 24 cm.
Answer» We have, Base radius of cone = 7 cm Height of cone = 24 cm Slant height of cone l = \(\sqrt{(r^2+h^2) }\) = \(\sqrt{(24^2+7^2)} \) = \(\sqrt{625}\) = 25 cm Hence area of metal sheet required = total surface area of cone = πr(l+r) = 22/7×7(25 + 7) = 704 cm²

Find the area of metal sheet required in making a closed hollow cone of base radius 7 cm and height 24 cm.

Answer»

We have,

Base radius of cone = 7 cm

Height of cone = 24 cm

Slant height of cone l = \(\sqrt{(r^2+h^2) }\)

= \(\sqrt{(24^2+7^2)} \)

= \(\sqrt{625}\)

= 25 cm

Hence area of metal sheet required = total surface area of cone

= πr(l+r)

= 22/7×7(25 + 7)

= 704 cm²