Question

what will be the length of a rectangle of breadth 10 cm whose perimeter is 42 m?

Answer 1

Answer:

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Step-by-step explanation:

Perimeter= 42m=42×100=4200cm; 2(l+10)=4200;l+10=2100; l=2100-10=2090 cm =20.9m

Answer 2

Answer:

$given \: that \: \: \\ breadth = 10cm \\ \\ to \: find \: length \\ \\ perimeter \: of \: rectangle \: = \: 42 \: cm \\ 2(length + breadth) = 42 \: cm \\ 2(length + 10) = 42cm \\ lenght + 10 = \frac{42}{2} \\ length = 21 - 10 \\ length = 11cm$

Therefore , length of rectangle is 11 cm.

Step-by-step explanation:

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