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− | | + | *Estimated Time: 40 minutes. |
| + | *Materials/ Resources needed: Laptop, geogebra file, projector and a pointer. |
| + | *Prerequisites/Instructions, if any |
| + | #The students should know the concepts of parallel lines, perpendicular lines and rectangle. |
| + | #They should know basic constructions like parallel lines and perpendicular lines. |
| + | *Multimedia resources: Laptop. |
| + | *Website interactives/ links/ / Geogebra Applets : This geogebra file has been done by ITfC-Edu-Team |
| + | <div id="ggbContainer9df782461d8386df4ddf9efd19c3d3ff"></div> |
| + | *Process: |
| + | #Recall the figure trapezium and its properties. |
| + | #State that a trapezium with two non- parallel sides equal is an isosceles trapezium. |
| + | #By moving the vertices of the trapezium, you can observe trapeziums of different sizes and shapes. |
| + | #Make sure you note when your trapezium turns into a rectangle. |
| + | #Observe the symmetry of an isosceles trapezium. |
| + | #Study its properties. |
| + | #Drag the vertices of the trapezium and observe your angle measures. |
| + | #Make a conjecture about the base angles of an isosceles trapezium. (Both of the parallel sides are considered bases, so a trapezium has two pairs of base angles.) |
| + | *Developmental Questions: |
| + | #What are parallel lines ? |
| + | #What is a trapezium ? |
| + | #Is trapezium a quadrilateral ? |
| + | #What are the characteristic properties of a trapezium ? |
| + | #What do you notice about the non-parallel sides ? |
| + | #How many interior angles do you see ? |
| + | #What is the sum of 4 angles of any quadrilateral ? |
| + | #What can you conclude about interior angles ? |
| + | #What is special about diagnols in an isosceles trapezium ? |
| + | *Evaluation: |
| + | #Are all trapeziums isosceles ? |
| + | #Are all trapeziums quadrilaterals too ? |
| + | #Can rectangle be considered as an isosceles trapezium ? |
| + | *Question Corner: |
| + | <span> </span> |
| + | #State the properties of isosceles trapezium ? |