Memorize the Table of Formulas!

Memorize the Table of Formulas!

We have seen formulas for area of ​​parallelogram, quadrilateral, rhombus and trapezium. I understand you are asking that the next move we need to look at are the formulas for their perimeters.

The formulas for their perimeters are the addition of their four sides.

Since the four sides of a quadrilateral and a trapezium, are not equal, if the four side measures are taken as variables a, b, c, d, then their perimeter is a + b + c + d units, isn't it?

Since the opposite sides of a parallelogram are equal, taking their opposite sides as variables a and b gives the formula for its perimeter as 2a + 2b units. If 2 in 2a + 2b is common taken out, the formula for the perimeter of the parallelogram is 2(a + b) units?

Since all four sides of a rhombus are equal, wouldn't the formula for its perimeter be 4a units if the equal side is taken ‘a’ as variable?

Isn't the same formula for the perimeter of a square? Yes. Are all four sides equal in both shapes square and rhombus? So the formula for its perimeter is 4a units.

I hope you have a good understanding of what we have said so far.

Next let's tabulate the formulas we've seen so far. What this is for is so that you can read these formulae many times and memorize them well. If you keep it in such a way, you will be able to immediately remember the appropriate formulas while doing the calculations and you will be able to do the calculations correctly and quickly.

Here is a table of formulas for perimeter and area.

S.No.	Shape	Perimeter (Units)	Area (Square Units)
1.	Square	4a	a2
2.	Rectangle	2(l+b)	lb
3.	Triangle	a+b+c	½bh
4.	Circle	2
5.	Quadrilateral	a+b+c+d	½d(h1+h2)
6.	Trapezium	a+b+c+d	½h(a+b)
7.	Rhombus	4a	½d1d2
8.	Parallelogram	2(a+b)	bh

 

We have basically learned everything we need to know about Shapes and measurements. I hear you asking what we should see next. Look forward to it tomorrow.

*****