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Question

In a right angled triangle, if AB=3 cm, BC=4 cm then what is the value of cos A?


  1. 35

  2. 45

  3. 34

  4. 23


Solution

The correct option is A

35


Since ABC is a right-angled triangle, we can apply Pythagoras theorem to get the length of side AC (hypotenuse).
Therefore, AC2=AB2+BC2
AC2=32+42
AC2=9+16=25
AC=25=5
AC=5
Now, cosA=ABAC=35.

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