Pre- Pythagoras and trigonometry work

A square number is the result when a number has been multiplied by itself.

So:

5² = 5 x 5 = 25

3² = 3 x 3 = 9​

Some text here about the topic of discussion

A square root is the opposite of a square.

The "root" of the square is the number that was used to make the square.

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1. Use the ​table at the back of your exercise book:

   • The numbers underlined in red are all squares.

   • Just find the two identical numbers that equal them​.

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Look at 9​.

What are the two identical numbers that multiply to equal 9?​

3 x 3 = 9​

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​See if you can do the same for 16, 25 and 36.

​To make sure you can see the scientific calculator:

1) Open your computer calculator.

2) Click on View (at the top of the screen)

3) Click on Scientific.​

On your calculator:

1) Type in the number you want to find the square root for.

2) Click on the symbol that looks like a tick √​ (It might not have a 2. )

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In right-angled triangles, one angle = 90°

We often show a right-angle by putting a little square.

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The opposite side is the hypotenuse

Opposite the 90° angle is the longest side.

It is called a hypotenuse.​

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If a triangle = 180​° and the right angle = 90​°

How much do the other angles equal?

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180​° - 90​°​ = 90​°​

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