A right angle looks like the corner of a sheet of paper.
Here's how:
1. Look closely at every corner of the figure.
2. Check with a paper corner or a set square whether the corner is a right angle.
3. Draw a dot in every right angle and count all the dots at the end.
The dots and numbers filled in show the solution.
Example
- 4
- 1
For parents
What does this exercise practice?
This exercise trains the eye for right angles in figures and prepares for measuring with a set square.
Common pitfalls
Children often fail to recognize right angles on slanted edges because they only look for horizontal and vertical lines. It helps to place a paper corner in the angle and turn the figure.
How to practice at home
Look for right angles around the house, for example on windows, doors, books and tiles.
Related: Tiling areas, Symmetry, Shapes