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Solution : Let the angles of the triangle be
a d,
a, a + d in degrees.
.. a - d + a + a + d = 180°
.. 3a = 180°
.. a = 60°
Also, smallest angle
= 40°
- a - d = 40°
.. 60° - d = 40°
.. 60° - 40° = d.
d= 20°
Now, a + d = 60° + 20° = 80°
Hence the angles are 40°, 60°, 80°
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