Changes
From Karnataka Open Educational Resources
1,014 bytes added
, 17:25, 6 September 2020
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| === Objectives === | | === Objectives === |
| + | To show that exterior angle of a triangle is equal to the sum of its interior opposite angles. |
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| === Estimated Time === | | === Estimated Time === |
| + | 30 minutes |
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| === Prerequisites/Instructions, prior preparations, if any === | | === Prerequisites/Instructions, prior preparations, if any === |
| + | Knowledge about point, lines and angles, adjacent angles, alternate angles, corresponding angles, linear pair |
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| === Materials/ Resources needed === | | === Materials/ Resources needed === |
− | Click here to [[:File:Exterior angle theorem of triangle.ggb|open]] the file | + | Digital : Click here to [[:File:Exterior angle theorem of triangle.ggb|open]] the file |
| + | |
| + | Non-digital : Worksheet, pencil, ruler, compass, protractor |
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| === Process (How to do the activity) === | | === Process (How to do the activity) === |
− | {{Geogebra|1=kxphjay3}} | + | {{Geogebra|1=kxphjay3}}'''Procedure:''' |
| + | # Draw triangle ABC |
| + | # Identify the angles of the triangle. |
| + | # What is the sum of the angles of a triangle? |
| + | # Extend one side, students should recognize the exterior angle formed. |
| + | # Measure the exterior angle of a triangle |
| + | # Identify interior opposite angles for the exterior angle of a triangle. Mark the angle in purple and green colour. |
| + | # Move the sliders and observe the changes. |
| + | # How are the two angles together related to the exterior angle? |
| + | # Do you notice any relation between the exterior angle and the interior angles |
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| === Evaluation at the end of the activity === | | === Evaluation at the end of the activity === |
− | | + | # What would be the measure of exterior angle for each vertex of an equilateral triangle? |
| + | # Does an exterior angle of a triangle is smaller than either of its interior opposite angles? |
| Go back to the page - [[KVS Triangles|click here]] | | Go back to the page - [[KVS Triangles|click here]] |