A rectangle ABCD is 20 cm long and 10 cm wide. There is a border towards the inner side of the rectangle that is 2 cm wide. Find the area of the border?
Answer: 104 cm²
Explanation
To find the area of the border, let's first find the area of the entire rectangle and the area of the inner rectangle.
Area of entire rectangle = Length × Width
= 20 × 10
= 200 cm²
The inner rectangle's dimensions are:
Length = 20 - 2 × 2 = 16 cm
Width = 10 - 2 × 2 = 6 cm
Area of inner rectangle = 16 × 6
= 96 cm²
Area of border = Area of entire rectangle - Area of inner rectangle
= 200 - 96
= 104 cm²
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