TNSB - 8 - Maths :: Geometry term 3

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Go To: TNSB-Mathematics-Grade 8

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[Contributor - Ananth]

Dear Volunteer,


Please find below the detailed lesson plan and PPT for this chapter in the language mentioned against the respective link. While the lesson plan will give an overall flow of the lesson, the PPT will include lesson flow as well as the presentations for the class.


https://drive.google.com/open?id=170_XLgufRzV9I3r6DZXPszzpnmIOtC6U (lesson Plan - English)


https://drive.google.com/open?id=1bYllTcmEQg8DXN-fo5UUKZN_pgYOmsOT (PPT - English)


You may use the content as it is or download and modify them to suit the students requirements.


If you feel any major modifications or additions are carried out by you in the form of adding any new activity, presentations, videos etc. we request you to send the modified version to submitcontent@evidyloka.org for enabling upload the modified version.


The worksheets of the lesson can be accessed from the worksheet tab.


Kindly rate the lesson plan and share your suggestions and comments on the lesson plan in the comments box below. Your valuble suggestions and comments will help us to improve the content.


[Contributor - Ananth]

Lesson Plan version 1.1 videos

https://www.youtube.com/watch?v=Oba0iqbzqX0 (Parts of a circle)

https://www.youtube.com/watch?v=BPnP_EEZvQc (Parts of a circle)


[Contributor - Ananth]

Lesson Plan version 1.1 activities

1. Ask children to draw three lines on a piece of paper or in their notebook. They could be intersecting and non- intersecting.

2. Explain how to draw medians of a triangle and ask them to draw medians of a triangle as you explain. Bring out that the medians are concurrent and their point of concurrency is called centroid.(

3. Ask them to draw a fairly large triangle (to make measurements easier) and find its centroid. Bring out that centroid divides each of the median in the ratio 2:1

4. explain how to draw altitudes of a triangle and show them the orthocentre. Ask children to draw the altitudes and identify the orthocentre as you explain.

5. . Ask children to draw a right angled triangle and their altitudes as explained in the slide. Bring out the fact that the orthocenter for a right angled triangle is the vertex of the right angle

6. Ask children to draw an obtuse angled triangle and their altitudes as shown in the slide. Bring out the fact that the orthocenter for an obtuse angled triangle is located in the exterior of the triangle

7. Ask children to draw an acute angled triangle and their altitudes as shown in the slide. Bring out the fact that the orthocenter for an acute angled triangle is located in the interior of the triangle.

8. Ask children to draw a triangle and their angle bisectors as shown in the slide.

Show and explain that the three angle bisectors are concurrent and their point of concurrence is called incentre.

9. Ask children to draw an acute angled triangle, an obtuse angled triangle and a right angled triangle. Ask them to draw their angle bisectors and bring out the fact that the incentre of triangle is always located in the interior of the triangle.

10. Ask children to draw a triangle and the perpendicular bisectors of their sides as shown in the slide.

Show and explain that the three perpendicular bisectors are concurrent and their point of concurrence is called Circumcentre.

11. Ask children to draw an acute angled triangle, an obtuse angled triangle and a right angled triangle. Ask them to draw the perpendicular bisectors of their sides. and bring out the location of circumcentre for different types of triangles.



[Contributor - Ananth]

Lesson Plan version 1.1 PPT

https://drive.google.com/open?id=1bYllTcmEQg8DXN-fo5UUKZN_pgYOmsOT


[Contributor - Sudha Thangaraj]


https://drive.google.com/open?id=0B4m07xnDF8JpMDc5VHlScGktUDg (worksheet)


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