Loading [MathJax]/jax/output/HTML-CSS/jax.js

Perimeter and Area of a Square

Here we will discuss about the perimeter and area of a square and some of its geometrical properties.

Perimeter and Area of a Square

Perimeter of a square (P) = 4 × side = 4a

Area of a square (A) = (side)2 = a2

Diagonal of a square (d) = (side)2+(side)2

                                    = a2+a2

                                    = √2a

Side of a square (a) = √A = P4


Some geometrical properties of a square

Geometrical Properties of a Square

In the square PQRS,

PQ = QR = RS = SP

PR = QS

∠PQR = ∠QRS = ∠RSP = ∠SPQ = 90°.

PR and QS are perpendicular bisectors of each other.

Area of the ∆POQ = Area of the ∆QOR = Area of the ∆ROS = Area of the ∆SOP


Solved Examples on Perimeter and Area of a Square:

1. The perimeter and the area of a square are x cm and x cm2 respectively. 

(i) Find the perimeter.

(ii) Find the area.

(iii) Find the length of a diagonal of the square.

Solution:

Let a cm be the measure of a side of the square.

Then the perimeter = 4 a cm, area = a2 cm2

From the question,

4a = x = a2

or, a2 - 4a = 0

or, a(a - 4) = 0  

Therefore, a = 0

or, a = 4

But, the side of a square ≠ 0

Hence, the side of the square = 4 cm

(i) Perimeter of a square = 4a

                                     = 4 × 4 cm

                                     = 16 cm

(ii) Area of a square = a2 cm2

                              = 42 cm2

                              = 16 cm2

(iii) Length of a diagonal = √2a

                                    = √2 ∙ 4 cm

                                    = 4√2 cm

                                    = 4 × 1.41 cm

                                    = 5.64 cm





9th Grade Math

From Perimeter and Area of a Square to HOME PAGE




Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.



New! Comments

Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.




Share this page: What’s this?