Physics

Question

For trapezoid JKLM, A and B are midpoints of the legs. Find AB.


Question 3 options:

29

20

59

58
For trapezoid JKLM, A and B are midpoints of the legs. Find AB. Question 3 options: 29 20 59 58

1 Answer

  • Answer:

    AB = 29

    Explanation:

    For a better understanding, we must work this problem in a graphic way. In the attached image we can see the solution.

    First, we draw a vertical dotted lines from the point J & K to the line ML, then we can see two new portions with the same length. Then with this simple analysis:

    2x = 39 - 19

    x = 10

    Then we know that x = 10, another important data to find the answer is that the AB line is located in the midpoints of the legs. We also can see the right triangle MJ and the dotted line.

    Now for every single right triangle, no matter its size and relationship between the vertical and the horizontal lengths, if some point is located in the hypotenuse (leg) at the middle of its length. This will be proportional to the vertical and the horizontal cathetus, therefore we will have the middle point on those two lines.

    So, the AB line will be the sum of JK plus two times 5

    AB = 19 + 5 + 5 = 29

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