Page 3 - LN 5

Let us solve another example. A square shaped chocolate cake in needs chocolate
icing on top. If each side of the cake is 18 inches long, what is the area of the cake
that needs icing?

A simple square chocolate cake, preferably the vertical sides covered with colourful
gems/kitkat
The area covered in chocolate icing is equal to the area of the square on top of the
cake.

Length of each side = 18 in.
Area = 18 x 18 = 324 sq. in.
Therefore, the top area of the cake that will need icing will be 324 square inches.

Example 1: Find the area of a square clipboard whose side measures 120 cm.

Solution:
Side of the clipboard = 120 cm = 1.2 m

Area of the clipboard = side × side
= 120 cm ×120 cm
= 14400 sq. cm

Example 2: The side of a square wall is 75 m. What is the cost of painting it at
the rate of Rs. 3 per sq. m?

Solution:
Side of the wall = 75 m
Area of the wall = side × side = 75 m × 75 m = 5625 sq. m

For 1 sq. m, the cost of painting = Rs. 3
Thus, for 5625 sq. m, the cost of painting = Rs. 3 × 5625 = Rs 16875
Area of rectangle is the region covered by the rectangle in a two-dimensional plane.
A rectangle is a 2d shape which has four sides and four vertices. All the four angles
of the rectangle are right angles. The opposite sides of the rectangle are equal and
parallel to each other.