Question 9 - Figure it out (Page 40 to 43) - Chapter 2 Class 6 - Lines And Angles (Ganita Prakash)

Transcript

Question 9 Measure all three angles of the triangle shown in Fig. 2.21 (a), 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 Fig. 2.21 (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. Measuring (a)∠ A = 45° Reading black label ∠ B = 65° ∠ C = 70° Notice that ∠ A + ∠ B + ∠ C = 180° Measuring (b)∠ C = 63° Reading black label ∠ B = 63° ∠ C = 54° Notice that ∠ A + ∠ B + ∠ C = 180° Measuring (c)∠ C = 97° Reading black label ∠ B = 53° ∠ C = 39° Notice that ∠ A + ∠ B + ∠ C = 180°