Volume & Surface Area Of Regular Objects - 2 Examples
In this lesson, we will go thru 2 examples on how to apply the concept of base area to find the surface area and volume of composite objects.
Related Lessons:
Example 1
The figure shows a closed container of uniform cross-section. The cross section consists of a square ABCD and a quadrant CED of a circle, centre D. Given that AB=7cm, AD=7cm and BH=CG=EF=AI=20cm, calculate
- The area of the cross section ADECB
- The volume of the container
- The surface area BCEFGH
[Take \(𝜋=\frac{22}{7}\)]
Example 2
A solid cylinder is made from melted iron. The height and diameter of the cylinder measured are 16cm and 15cm respectively.
- Calculate the volume of iron needed to make the cylinder. (Take \(π=3.14\)).
- Ten such cylinders are melted to make cubes whose side is 3mm each. What is the maximum number of cubes that can be made from the cylinders?