Subject: Mathematics
Book: Maths Mastery
Cylinder volume is found using the formula V = πr²h, where r is the radius of the circular base and h is the height. For a cylindrical container with radius 3 cm and height 10 cm, the volume is π × 3² × 10 = 90π cm³. This concept is ubiquitous: from determining how much liquid a tank can hold to calculating the volume of rolled sheets. A firm grasp of cylindrical volume paves the way for analyzing advanced solids like cones or spheres in geometry, engineering, and everyday scenarios (e.g., deciding the right size of a water tank).
A number is increased by 20% and then decreased by 20%. What is the net change?
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