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Question

The isosceles trapezoid has bases of 20 unit and 27 unit respectively. Determine the circumference of this trapezoid if the other side of trapezoid measures 21 unit.

A
88 unit
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B
68 unit
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C
89 unit
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D
90 unit
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Solution

The correct option is C 89 unit
Concept: A trapezoid which has its non parallel sides equal in length are called isosceles triangle.

Lets draw a trapezoid ABCD of the given dimensions:
Since, it is a isoceles trapezoid,
AB = CD = 21 unit.

Perimeter of trapezoid = sum of all sides = AB + BC + CD + DA
=21+27+21+20
=89 unit

Option (c) is correct.

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