Mathematics
Grade9
Easy

Question

Determine the value of y.

  1. 3 square root of 2
  2. 4 square root of 3
  3. 6
  4. 1

hintHint:

We are given a right-angled triangle. We are given two of its angle. It is 30°-60°-90° triangle. We are given the values of one of its side. It is 6. We are asked to find it’s hypotenuse.

The correct answer is: 4 square root of 3


    Let the given triangle be ABC.
    ∠ABC = 90°
    ∠BAC = 30°
    AB = 6
    BC = x
    AC = y
    The sum of all angles of a triangle is 180°. Therefore, the remaining angle will be 30°
    So, ∠BCA = 30°
    It is 30°-60°-90° triangle.
    In a 30°-60°-90° triangle, the length of hypotenuse is two times the length of the smallest side. It’s longer side is √3 times the value of the smallest side.
    The side opposite to the 30° angle is the smallest side.
    The side opposite to the 60° angle is the longer side.
    In the given question, the side opposite to 30° is BC. And the side opposite to 60° is AB.
    Length of smallest side = x
    Hypotenuse = y
    Length of longer side = 6
    So we can write,
    Length of longer leg = √3 ( length of smaller leg)
    AB = √3(BC)
    So, to find the smaller leg we have to divide the longer side by √3.
    BC = AB ÷ √3
    BC = 6 ÷ √3
    BC = 2√3
    Now,
    Hypotenuse = 2(length of smallest side)
    AC = 2(2√3)
    y = 4√3
    Therefore, the length of the hypotenuse is 4√3

    For such questions, we should know about the properties of a right-angled triangle and 30°-60°-90° triangle. The alternate way to solve the above question is by Pythagoras theorem and trigonometric ratios.

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