Find the perimeter of a rectangle whose length is 40 cm and diagonal is 41 cm

Length and Width of a Rectangle Calculator Length and Width of a Rectangle Calculator is a free online tool which helps to find side length of What is Length and Width of a Rectangle Calculator? A rectangle is a closed two-dimensional figure with four sides and four corners. The length of the opposite sides is equal and parallel to each other. Length and Width of a Rectangle Calculator is a free online tool that calculates the length and the width of a rectangle within a few seconds. Length and Width of a Rectangle Calculator NOTE: Enter numbers upto 3 digits. How to Use the Length and Width of a Rectangle Calculator? Follow the steps mentioned below to find the length and width of a rectangle. • Step 1: Enter the value of the • Step 2: Click on " Calculate"to find the respective length and the width of the rectangle. • Step 3: Click on " Reset" to clear the fields and enter the new values. How to Calculate Length and Width of a Rectangle? The formula for the A = l × w". The formula for the P = 2(l + w). To calculate the length and width of a rectangle first, calculate the value of width 'w' by using the area of rectangle formula that is, ' w = A/l'. Then substitute the value of width in the formula of the perimeter of a rectangle and simplify the value of length 'l', that is, P = 2 (l + A/I). Then substitute the value of the length 'l' of the rectangle in the equation w = A/l and simplify to find the width 'w'. Let's learn through an example how to find the length and wid...

Given diagonal (PR) = 41 cm, length (PQ) = 40 cm Let breadth (QR) be x cm. Now, in right angled triangle PQR, (PR)² = (RQ)² + (PQ)² [By Pythagoras theorem] ⇒ (41)² = x² + 1600 ⇒ 1681 = x² + 1600 ⇒ x² = 1681 – 1600 ⇒ x² = 81 ⇒ x= √81 = 9 cm Therefore the breadth of the rectangle is 9 cm. Perimeter of rectangle = 2(length + breadth) = 2 (9 + 49) = 2 x 49 = 98 cm Hence, the perimeter of the rectangle is 98 cm. Class 7 Maths Chapter 6 Exercise 6.5