10. An isosceles trapezium has two parallel sides 50 cm and 70 cm. If the perimeter of the trapezium is 220 cm.
Find the length of the other two sides.
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Explanation:
For an isosceles trapezium the base angles are of same degree and the opposite non parallel sides sides are equal in length.
Given,
Perimeter = 220 cm
Let, the sides be
ab = 50 , cd = 70 , ad = bc = x
ab + cd + ad + bc = 220
50 + 70 + x + x = 220
120 + 2x = 220
2x = 100
x = 50
Therefore, the two sides are : ad = bc = 50 cm
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