Question
The parallel sides of a trapezium are in the ratio 3:4. If the distance between the parallel sides is 9cm and the area is 126cm2, find the length of its parallel sides.
Hint:
let the length of parallel sides be x and y (x<y).Given ratio of x:y = 3:4
Substitute the equation in the formula area of trapezium = ½ ×(height)(sum of lengths of parallel side) and equate to find x and y
The correct answer is: 12cm and 16cm respectively.
Ans :- 12 cm ,16 cm
Explanation :-
Step 1:- Find the equation between x and y and find the sum of lengths of parallel sides in terms of y.
let the length of parallel sides be x and y (x<y).
Given ratio of x:y = 3:4
Sum of lengths of parallel sides =
Step 2:-substitute the values in the area formula
Given area of trapezium = 126 sq.cm
Altitude (or) height = 9 cm
area of trapezium = ½ × (height)(sum of lengths of parallel side)
We get y = 16 cm
Step 3:- find x by from
We get x =12 cm.
Therefore, the lengths of parallel sides are 12 cm and 16 cm respectively .
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