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Question Measure all three angles of the triangle shown in the figure (a) given below and write the measures down near the respective angles. Now add up the three measures. What do you get?
Do the same for the triangles in the figure (b) and (c).
Try it for other triangles as well, and then make a conjecture for what happens in general! We will come back to why this happens in a later year.
45°+ 65°+ 70°= 180°
56° + 62°+ 62° = 180°
30° + 52° + 98° = 180°
In general, we observe that sum of all angles of a triangle is 180°.
2.9 Measuring Angles Figure it Out (Page No. 45-46)