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Hotel Oberoi (Chandigarh)
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Answer:
REF.Image.
In isosceles trapezium, AD = BC
Let DC = 3a cm
⇒ AB = a cm
As sum of opposite sides is equal,
⇒AD+BC=4a⇒2AD=4a⇒AD=2a
Now perimeter = 16 cm ⇒8a=16⇒a=2cm
In △ALD,AL
2
=AD
2
−DL
2
(Pythagoras th.)⇒AL
2
=16−4=12
⇒AL=
12
=2
3
cm
Now, Area of trapezium =
2
1
(Sum of parallel sides)Height
=
2
1
(4a)(2
3
)
=2a×2
3
=4×2
3
=8
3
cm
2
Explanation:
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