Question

find the area of rectangle whose perimeter is 42 cm and length is 12 CM

Answer 1

HEY MATE YOUR ANSWER IS

Area of a rectangle = length × breadth
=) 12 × 2.5 =) 30 cm^2

Perimeter of a rectangle =) 2( length + breadth)

=) 2 ( 12 + 2.5 )

=) 2 × 14.5 

=) 29 cm.

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Answer 2

Let the breadth be x cm
length = 12 cm
perimeter of rectangle = 2 (l+b)
42 cm = 2 ( 12 + x )
42 / 2 = 12 + x
21 = 12 + x
21 - 12 = x
x = 9
Therefore breadth = 9 cm
Area of rectangle = l * b
= 12 * 9 cm sq
= 108 cm sq