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A notice board is 120 cm by 90 cm. A coloured paper strip 5 cm wide is pasted along the inside of all four edges. What is the area of the strip?

Class 7Area of Paths and BordersPerimeter and Area

A $2100 cm^{2}$
B $2000 cm^{2}$
C $2200 cm^{2}$
D $8800 cm^{2}$

Step-by-Step Solution

Inner:

110 \times 80 = 8800 cm^{2}

. Board:

10800 cm^{2}

. Strip

= 10800 - 8800 = 2000 cm^{2}

. (2100 counts corners twice; 2200 is a strip outside.)

Answer: B)

2000 cm^{2}

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