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Question

Triangle ABC has base angles 30 and 120  respectively. The perimeter is 4+23. What type of triangle is this?


  1. Right triangle
  2. Isosceles triangle
  3. Scalene triangle
  4. Equilateral triangle


Solution

The correct option is B Isosceles triangle
It is given that 2 of the angles are 120 and 30respectively.
Since the sum of the angles of a triangle is 180, the 3rd angle is calculated to be 30.
As two angles of the triangle are equal, the triangle is isosceles.

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