Mathematics
Grade9
Easy

Question

Find side length X.

  1. 16
  2. 18
  3. 2.4
  4. 15

hintHint:

We are given two triangles. They are similar. The triangles are ABC and XYZ. We are given some values. We are asked to the value of “x” which is the side of a ∆ABC. We will use the properties of similar triangle to solve the question.

The correct answer is: 15


    The triangles are ABC and XYZ.
    The given values are as follows:
    AB = 25
    AC = x
    XY = 10
    XZ = 6
    ZY = 8
    We are also given that the triangles are similar.
    Similar triangles have different size but same shape. Their sides are in proportion.
    The ratio of their sides are equal.
    So we can write,      
    fraction numerator A C over denominator X Z end fraction equals fraction numerator A B over denominator X Y end fraction
x over 6 equals 25 over 10
x space equals space fraction numerator 25 space cross times space 6 over denominator 10 end fraction
x space equals space 15
    Therefore, the value side AC is 15.

    For such questions, we should know the properties of similar triangles.

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