Arthur Lee
Some angles are marked in this figure. For each angle, you may change its colour and show its measurement. (Toggle to open the style bar on the top right corner when an angle is selected. See the quick demo below.) Show the measurement of some angles so that the remaining angles can be found accordingly. How many angle measurements do you need in order to find out the sizes of all other angles? As a warm up task, the teacher may change the colour of two angles to red and ask the students to indicate all angles that can be found from the red angles (by changing their colour to blue, for example).

Which of the following must be correct?

Check all that apply

What other questions would you ask about these angles or this figure?

quick demo