Surface Area Worksheet 10. 11. A sphere has a radius of 66.75 cm. What is the surface area in m2? What is the surface area of a concrete sphere if the diameter is 1.15 metres? A cooling water suction pipe is 10 metres long and has a diameter of 2.3 metres. What is the surface area? How much mild steel is required to construct a fullyr enclosed tank with the following dimensions? Length = 2.5m, width = 1.75m, height = 1.4m. A cylindrical tank with flat ends is 3.4 metres long and has a radius of 1.1 metres. Calculate the total surface area. The surface area of a sphere is 2.33 ml. Calculate the radius of the sphere. What is the unknown dimension ofthe following enclosed rectangular tank? Height = 4.14 m, length = 5.45 m, surface area = 112.25 m2. What is the total surface area, in cm2, of a triangular prism which is 65 mm long and whose cross section is in the shape of an equilateral triangle with sides of 15 mm? What is the total surface area (including the base} in cm2 of a cone shaped pyramid 45 mm high with a base radius of 20mm? An open cylindrical tank has one hemispherical end as shown below. If the tank diameter is 5.75 m, and the overall height is 5.0 m, what is the total surface area? An enclosed circular hopper is shaped as shown below. If the height is 10m and the radius is 2.5m, what is the total surface area? The bottom cone has a cross section profile of an equilateral triangle. 17. How much material is wasted if we cut the largest possible circular plate from a rectangular piece of metal 14.0 x 20.0 centimetres? 18. The window shown below consists ofa rectangle surmounted by a semi-circle. The rectangle is 2.0 m wide and 1.0 m high. Find the total area. 19. Carefully examine the ratchet wheel shown below. The centre hole is 2.5 cm in diameter. Find the total area