Area Calculator

Welcome to the Area Calculator! here I will show you how to calculate the area for these shapes:

Square
Rectangle
Triangle
Circle

First up is the square.

$A = l\times\l = l^2$

And this is the formula on how to calculate the area of square.

Let’s look at an example. Let’s say $l$ is $5cm$ . This is how we calculate the area of the square.

$A = 5cm\times\ 5cm = 25cm^2$

Now it’s time for the rectangle.

$A = h\times\ w = hw$

So this is how we calculate the area of a rectangle. Now, let’s look at an example. $h$ will be $4 cm$ , and $w$ will be $7cm$ .

$A = 4cm\times\ 7cm = 28cm^2$

It’s the triangle next.

basically, this triangle is half of a square. So, after making out the area of the square we have to multiply it by half.

$A = h\times\ w\times\ \frac{1}{2}$

This is how we calculate this triangle. If you still don’t understand, here, I’ll give you an example.

$h = 6cm, w = 6cm$

$A = 6cm\times\ 6cm\times\ \frac{1}{2} = 18cm^2$

Do you get it now? I hope you do! but now here comes the hardest shape to calculate to area..

Circle! This involves $\pi$ , which is about $3.14$ .

The formula for the circle’s area is as follows–

$A$ = $\pi$ $r^2$

here is an example:

r = 3cm

$A$ = $3.14$ $\times$ 3cm^2$

That is it for our lesson today! see you on the next lesson: Volume Calculator!

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