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Question

In capital delta A B C space i f space c o s squared A plus c o s squared B plus c o s squared C equals 1 comma then the triangle is.

  1. equilateral    
  2. right angled    
  3. isosceles    
  4. scalene triangle.    

The correct answer is: right angled


    STEP BY STEP SOLUTION
    In capital delta A B C space i f space c o s squared A plus c o s squared B plus c o s squared C equals 1 comma then the triangle is.
    A equals 3 0 to the power of 0 end exponent comma B equals 60 to the power of 0 end exponent comma C equals 90 to the power of 0 end exponent.
    It is a RIGHT ANGLED TRIANGLE

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