Question
The area of a trapezium is 24 sq.cm The distance between its parallel sides is 4 cm. If one of the parallel sides is 7 cm, what is the measure of the other parallel side?
Hint:
Now , find the area of Trapezium = ½ height × (sum of lengths of parallel sides).
We know the area , one of the parallel sides and height of trapezium .
Substitute them in the above area formula and obtain the length of the other parallel side.
The correct answer is: 5cm
Ans :- 5 cm.
Explanation :-
Given, area of trapezium = 24 sq.cm ,the length of parallel side is 7 cm
Let the length of the other parallel side be x cm .
Altitude or height = 4 cm
Area of trapezium =(height) (sum of lengths of parallel sides)
Therefore, the length of the unknown parallel side is 5 cm .
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Note:
The equations can be solved in many other ways like substitution
method which is: to eliminate one variable in any one of the
equations with the help of other equation. As we need to find the
value of x, we try to find the value of y in terms of x from one
equation. Then put that value of y in the other equation to get a linear equation in one variable , which is x.