2. Find the value of the unknown interior angle x in the following figures:
THE TRIANGLE AND ITS PROPERTIES
119
Po
6.11
125°
70°
309
1150
100°
angleis
х
160°
800
1200
x
30°
X
ite
350
(iv)
te
(vi) 7500
6.5 ANGLE SUM PROPERTY OF A TRIANGLE
There is a remarkable property connecting the three angles of a triangle. You are going to
see this through the following four activities.
1. Draw a triangle. Cut on the three angles. Rearrange them as shown in Fig 6.13 0.().
pole This apple is a straight angle and so has
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