Mathematics
Grade9
Easy

Question

In the figure, DE ll AB and If CE = t – 2, EB = t + 1, CD = 2, and CA = 10, find t.

  1. 6
  2. 3
  3. 9
  4. 12

hintHint:

If a line is drawn parallel to any one side of a triangle so that it intersects the other two sides in two distinct points, then the other two sides of the triangle are divided in the same ratio.

The correct answer is: 3


    fraction numerator C E over denominator B C end fraction equals fraction numerator C D over denominator D A end fraction space left parenthesis P r o p o r t i o n a l i t y space t h e o r e m space f o r space t r i a n g l e s right parenthesis
fraction numerator left parenthesis t minus 2 right parenthesis over denominator left parenthesis t plus 1 right parenthesis end fraction equals 2 over 8
8 left parenthesis t minus 2 right parenthesis equals 2 left parenthesis t plus 1 right parenthesis
8 t minus 16 equals 2 t plus 2
8 t minus 2 t equals 16 plus 2
6 t equals 18
t equals 18 over 6 equals 3
    Hence, the correct option is C.

    It is also called basic proportionality theorem.

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