Question

Find the perimetre of a rectangle, where its lengh 'l' and breadth 'b'.​

Answer 1

Given : Length of Rectangle is l and Breadth of Rectangle is b .

Need To Find : The Perimeter of Rectangle ?

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$\bigstar \:\underline {\sf{\: According \:To\:The\:given \:Question \:\::\:}}\:$

▪︎Perimeter : The Perimeter of any Regular Polygon is the Total Length of it's Boundary .

$\dashrightarrow \sf \:Perimeter \:=\: Sum\:_{\:(\:All\:it's\:side\:)}\:$

• Rectangle : It's a two-dimensional shape with 4 sides whose Parallel sides are equal to each other.

$\\\dashrightarrow \sf \:Perimeter_{\:(Rectangle)}\:=\: Sum\:_{\:(\:All\:it's\:side\:)}\:\\\\\\ \dashrightarrow \sf \:Perimeter_{\:(Rectangle)}\:=\: Length \:+\:Length \:+\:Breadth \:+\:Breadth \:\\\\\\ \dashrightarrow \sf \:Perimeter_{\:(Rectangle)}\:=\: 2Length \:+\:2\:Breadth \:\\\\\\ \dashrightarrow \sf \:Perimeter_{\:(Rectangle)}\:=\: 2\:(\:Length \:+\:\:Breadth\:) \:$

$\qquad \dag \:\underline {\frak{Substituting \:known \:Values \:in \:Formula \:\::\:}}$

where :

• Length of Rectangle is l .
• Breadth of Rectangle is b .

$\\\dashrightarrow \sf \:Perimeter_{\:(Rectangle)}\:=\: 2\:(\:Length \:+\:\:Breadth\:) \:\\\\\\\dashrightarrow \pmb{ \sf \:Perimeter_{\:(Rectangle)}\:=\: 2\:(\:l \:+\:\:b\:)} \:$

∴ Hence, Perimeter of Rectangle is 2 ( l + b ) .

Answer 2

❒ Given :-

➵ Find the perimeter of a rectangle ,with its length l and breadth b.

❒ To Find :-

➵ Perimeter .

❒ Solution :-

⇝Let :

• Length of rectangle = l

• Breadth of rectangle = b

✏ There are l and b :

There are 2 lengths and 2 breadths in a rectangle.Hence ,

${\bf{2 \times l + 2 \times b }}$

✏It can be written as :

${\large{\green{:{\longmapsto{\red{\underline{\overline{\bf{2(L + B)}}}}}}}}}$

❒ Hence :-

${\large{\purple{\underline{\red{\underline{\red{\mathfrak{Perimeter = 2(L + B)}}}}}}}}$