# All Shapes

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We can say term shape is an appearance of an object. We have two kinds of shapes. Those are simple shape and complex shape. We can define the Simple shapes by basic geometric concepts. Those are straight lines, planes, spheres and cubes…etc. We know complex shape is combine parts or by all of simple shapes.

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.