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We can also classify the shapes by the number of their sides. For example, all two dimensional shapes made of straight lines are considered as polygons.

Example 1: Find the Area and perimeter of the shape circle with radius 7 cm.

Solution: The given shape is a circle.

Radius = r = 7 cm

The formula to find the Area of circle = pi r^2

= 22/7 * 7^2

= 22 x 7 = 154 square cm

The formula to find the perimeter = 2 pi r

= 2 x 22/7 x 7

= 2 x 22 = 44 cm

Example 2: Find the volume and surface area of the shape cube with 6 cm.

Solution:

The length of the side of a cube is = a = 6 cm

Volume of a cube = a^3

Now we can plug the a value in this formula

Therefore, Volume of a cube = 6^3 = 216 cubic cm

Surface area of the shape cube is = 6 x a^2

Now we can plug the a value in this formula

Surface area of the shape cube is = 6 x 6^2 = 6^3 = 216 square cm.