... Climate the best square has the specific same area as the other two squares put together!


It is referred to as "Pythagoras" Theorem" and can be written in one brief equation:

a2 + b2 = c2



is the longest side of the triangle a and b are the other two political parties


The longest side of the triangle is called the "hypotenuse", for this reason the formal meaning is:

In a ideal angled triangle:the square the the hypotenuse is equal tothe sum of the squares the the other two sides.

You are watching: A square b square c square

Example: A "3, 4, 5" triangle has a best angle in it.


Let"s examine if the locations are the same:

32 + 42 = 52

Calculating this becomes:

9 + 16 = 25

It functions ... Like Magic!


Why Is This Useful?

If we recognize the lengths of two sides that a right angled triangle, we can discover the size of the third side. (But remember it just works on right angled triangles!)

How execute I use it?

Write it under as an equation:

a2 + b2 = c2

Example: resolve this triangle



Read Builder"s mathematics to see helpful uses because that this.

Also read about Squares and also Square roots to uncover out why √169 = 13

Example: solve this triangle.


Example: What is the diagonal distance throughout a square of size 1?


It functions the other means around, too: once the three sides the a triangle make a2 + b2 = c2, then the triangle is appropriate angled.

Example: walk this triangle have actually a best Angle?

Does a2 + b2 = c2 ?

a2 + b2 = 102 + 242 = 100 + 576 = 676
c2 = 262 = 676

They are equal, for this reason ...

Yes, that does have actually a ideal Angle!

Example: go an 8, 15, 16 triangle have a right Angle?

Does 82 + 152 = 162 ?

82 + 152 = 64 + 225 = 289, however 162 = 256

So, NO, that does not have actually a ideal Angle

Example: walk this triangle have a appropriate Angle?


Does a2 + b2 = c2 ?

And You deserve to Prove The Theorem you yourself !

Get file pen and scissors, then utilizing the following animation as a guide:

draw a right angled triangle top top the paper, leaving plenty of space. Draw a square follow me the hypotenuse (the longest side) draw the very same sized square on the other side of the hypotenuse attract lines as displayed on the animation, favor this:
reduced out the forms Arrange castle so that you have the right to prove that the large square has actually the same area as the 2 squares top top the various other sides

Another, Amazingly Simple, Proof

Here is among the earliest proofs that the square on the lengthy side has the exact same area together the various other squares.

Watch the animation, and also pay attention as soon as the triangles start sliding around.

You might want to clock the computer animation a couple of times to know what is happening.

The violet triangle is the crucial one.

See more: Pound Of Weed In A Bag For Cannabis, How Many Grams Are In A Pound Of Weed


We likewise have a proof by adding up the areas.

historic Note: if we contact it Pythagoras" Theorem, the was also known by Indian, Greek, Chinese and also Babylonian mathematicians well prior to he lived.
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Activity: Pythagoras" TheoremActivity: A to walk in the Desert
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