Question

Find the perimeter of a rectangle whose length is ( 5a – b ) units and breath is 2 ( a + b ) units.​

Answer 1

$\textrm{Perimeter of Rectangle = 2 \times [Length + Breadth]}$

$\longrightarrow\textrm{Perimeter of Rectangle = 2 \times [(5a - b) + 2(a + b)]}$

$\longrightarrow\textrm{Perimeter of Rectangle = 2 \times [5a - b + 2a + 2b]}$

$\longrightarrow\textrm{Perimeter of Rectangle = 2 \times [5a + 2a - b + 2b]}$

$\longrightarrow\textrm{Perimeter of Rectangle = 2 \times [7a + b] = 14a + 2b}$

Answer 2

Given

we have given length of Rectangle is (5a-b) units and breadth of Rectangle is 2(a+b) units.

To find

we have to find the perimeter of Rectangle

$\sf\huge\bold{\underline{\underline{{Solution}}}}$

Step by step explanation:

1. First write down the formula of perimeter of Rectangle.
2. Put the given dimensions into the formula
3. Evaluate it.
4. Final answer

Perimeter of Rectangle= 2(length+ breadth)

Length = (5a-b) units and breadth= 2(a+b) units

Put the values into formula

=>perimeter of Rectangle=2[ (5a-b)+2(a+b)]

=>Perimeter of Rectangle= 2[5a-b+2a+2b]

=>Perimeter of Rectangle= 2[ 5a+2a-b+2b]

=>Perimeter of Rectangle=2( 7a+b)

=>Perimeter of Rectangle=$\bold{\red{( 14+2b )\:units}}$

Extra information=>

Perimeter is the total distance occupy by a solid 2D figure around its edge.

Area of Rectangle= length× breadth

Rectangle

• A rectangle is a type of quadrilateral.
• Opposite sides are parallel & equal
• Sum of all Interior angles makes 360°
• Diagonals bisects each other and both diagonals are of same length.