Geometry
Using a protractor. More Here and here (click on measure)
How to draw a regular hexagon (or decagon) using a ruler and a compass
Try it out in your copybook or maybe start by drawing a perfect square using this fantastic geometry drawing website. Here’s another drawing program. You can install this app from the Google Chrome store.
https://www.mathsisfun.com/pythagoras.html
More Geometry-Pythagaros’ Theorem
In a right-angled triangle, the square on the hypotanuse (the long side) is equal in area to the sum of the squares on the other two sides (of the triangle).
Pythagaros’ Theorem Exercises or Click here

Find N (use Pythagaros)
Explanation without words. Use the slider.
Pythagaros with Post-It notes (animation-you will need 50)…
…..and with biscuits!!
https://www.mathsisfun.com/pythagoras.html