Practicing Success
A heap of wheat is in the form of a cone whose base diameter is 8.4 m and height is 1.75 m. The heap is to be covered by canvass. What is the area (in m$^2$) of the canvas required? (Use $\pi = \frac{22}{7}$) |
60.06 60.6 115.05 115.5 |
60.06 |
We know that, H2 = B2 + P2 The curved surface area of the cone = πrl We have, Diameter of cone = 8.4m Height of cone = 1.75m Radius of cone = \(\frac{8.4}{2}\) = 4.2 m Using Pythagoras Theorem, = l = \(\sqrt {4.2^2 + 1.75^2}\) = 4.55 m The curved surface area of the cone = \(\sqrt {3}\) × 4.2 × 4.55 = 60.06 m2 |