A school notice board is a rectangle 145 cm long and 60 cm wide. What is its area?

Class 6MensurationMensuration

Step-by-Step Solution

A = l \times b = 145 \times 60 = 8700 cm^{2}

. 410 cm is the perimeter,

2 \times (145 + 60)

, and 205 is just length + breadth. Watch the unit as well: "8700 cm" has the right number but a length unit, and an area must be given in

cm^{2}

Answer: D)

8700 cm^{2}

Area measures how much flat space a shape covers. The unit is a **square** of side 1 — so

cm^{2}

(square centimetres),

m^{2}

(square metres), etc. To measure the area of a rectangle visually, imagine covering it with 1-cm squares: count them. A rectangle 5 cm by 3 cm holds

5 \times 3 = 15

little squares, so its area is

15 cm^{2}

. The general formula is the same idea: area of rectangle =

l \times b

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