Дүрс дэхь тэгш өнцгүүд (албан бус тодорхойлолт)

Identify right angles in shapes.


Many shapes have corners. We call a corner a right angle if we can fit a little square perfectly inside it.

Consider the trapezoid

Let's draw a square in each corner.
In which corners did the little square fit perfectly?
The trapezoid has two right angles.


First, let's study some more examples.
Now, try it yourself.

Challenge problem