Q2 of 24 Page 236

The radius and height of a cone are in the ratio 4:3. The area of its base is 154 cm. Find its CSA (Curved Surface Area).

We have given the ratio of radius and height 4 : 3


Let Radius (r) be 4x


And Height (h) be 3x



Given the area of base= 154


⇒


⇒


⇒


⇒ Radius (r) = 4x = 4 × (1.75)


= 7


Height(h) = 3x = 3 × (1.75)


= 5.25


Slant Height (l) =


=


=


=


= 5x


= 5 × 1.75


= 8.75


So


=


= 192.5


So, CSA of the cone is 192.5 cm2


More from this chapter

All 24 →
1

If the volume of a cube is 3√3 a3 then the total surface area of the cube is

 3

The radius and height of a cylinder are in the ratio 4:7. Find the radius and height of the cylinder if it's volume is 1188cu cm. Also, find the total surface area.

 4

If the total surface area of the cube is 96cm2. Then find its volume.

 5

Calculate the edge of a cube if its volume is 1331 cm3