Question

The shorter side of a rectangle is 20cm and it’s perimeter is 90cm. Find the size of the longer side

Answer 1

Given :

• Shortest side of rectangle (Breadth) = 20 cm
• Perimeter of rectangle = 90 cm

To Find :

We have to find the largest side (Length) of the rectangle.

Solution :

We know the formula to calculate the perimeter of rectangle.

⟹ Perimeter = 2(Length + Breadth)

→ 90 = 2(Length + 20)

→ 90/2 = Length + 20

→ 45 = Length + 20

→ Length = 45 - 20

→ Length = 25 cm

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★ Diagram :

$\setlength{\unitlength}{1.5cm}\begin{picture}(8,2)\linethickness{0.4mm}\put(7.7,3){\large\sf{A}}\put(7.6,2){\sf{\large{20}}}\put(7.7,1){\large\sf{B}}\put(9.2,0.7){\sf{\large{Length}}}\put(11.1,1){\large\sf{C}}\put(11.1,3){\large\sf{D}}\put(8,1){\line(1,0){3}}\put(8,1){\line(0,2){2}}\put(11,1){\line(0,3){2}}\put(8,3){\line(3,0){3}}\end{picture}$

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