In the figure above, |CD| is the base of the triangle CDE. Find the area of the figure to the nearest whole number.

Find the radius of a sphere whose surface area is 154 cm²  [Take $\pi =\tfrac{22}{7}$]

A cylindrical tank has a capacity of 6160m³. What is the depth of the tank, if the radius of its base is 28m? [Take $\pi =\tfrac{22}{7}$]

A solid metal of side 3 cm is placed I a rectangular tank of dimension 3, 4 and 5 cm. What volume of water can the tank hold?

A sector of circle of radius 7.2cm which subtends an angle of 300^oat the centre is used to form a cone. What is the radius of the base of the cone?