trapezium
AB and CD are parallel.
E, F are midpoints of 2 sides.
Measure the lengths of the segments AB, CD and EF.
How are they related?
The silent video below shows the construction of this trapezium.
- A line parallel to AB is drawn and hidden during the construction.
- Use the measure tool to find the lengths of some segments (or simply show the 'value' of a segment object from the style bar)
- Open the algebra view on the left. Input expressions about some lengths to check their relation.