Class IX

If one angle of a triangle is 130 degree, then the angle between the bisectors of the other two angles is
  1. 145
  2. 150
  3. 155
  4. 160
The angles of a triangle are in the ratio 5 : 3 : 7, the triangle is :
  1. An acute angled triangle
  2. A right triangle
  3. An obtuse angled triangle
  4. An isosceles triangle.
If one angle of a triangle is equal to the sum of the other two angles, then the triangle is :
  1. An isosceles triangle
  2. A right triangle
  3. An obtuse angled triangle
  4. An equilateral triangle
An exterior angle of a triangle is 800 and two interior opposite angles are equal. Measure of each of these angles is :
  1. 100°
  2. 40°
  3. 120°
  4. 60°
The angle which is equal to 8 times its complement is :
  1. 720
  2. 800
  3. 900
  4. 880
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