Question

perimeter of rectangle is 30 cm and lenght is 8 cm. Find its breadth​

Answer 1

$\large \underline{ \underline{ \sf \: Solution : \: \: \: }}$

Given ,

$\star$Perimeter of rectangle = 30 cm

$\star$Length = 8 cm

We know that ,

$\large \sf \fbox{ \fbox{Perimeter \: of \: rectangle = 2( l + b)}}$

$\sf \implies 30 = 2(8 + breadth) \\ \\ \sf \implies \frac{30}{2} = 8 + breadth \\ \\\sf \implies 15 - 8 = breadth \\ \\\sf \implies breadth = 7 \: \: cm$

Hence , 7 cm is the required value of breadth

Answer 2

Step-by-step explanation:

perimeter of rectangle =2(l+b)

=2(8+b)

30 =16+2b

therefore breadth of rectangle

2b=30-16

=14

b=14÷2

=7