Question

i dont understand perimeter and area at all of class 7. plz explain it and also write all the forumalas of it plz. ​

Answer 1

So my friend, I will try my best to explain you that:

Perimeter is the length of the boundary of any shape. Suppose a field, a square field, and you want to give a fence around it. Now, for that, you have to measure the boundary. So, that's the perimeter.

Generally, the perimeter refers to sum of all sides of a shape.

For square, perimeter is (4× side).

For rectangle, perimeter is {2×(length+breadth)}

For triangle, perimeter is (3×side).

Now, let's come over to area.

Consider the square field again.

But now, you are going to fence it, you are going to pave it with bricks and cement.

But fot that, you need to know how much place the field covers. So, that's the area. It means the place covered by a shape.

Generally, in case of any quadrilateral, we just take two adjacent sides of the shape and multiply them. And the unit gets squared.

For square, (side)² units² is the formula.

For rectangle, (length×breadth) units².

Hope you understand.