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Complete the Following Statement by Means of One of Those Given in Brackets Against Each: f one pair of opposite sides are equal and parallel, then the figure is - Mathematics

MCQ
Fill in the Blanks

Complete the following statement by means of one of those given in brackets against each:

If one pair of opposite sides are equal and parallel, then the figure is ........................

Options

  • parallelogram

  • rectangle

  • trapezium

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Solution

If one pair of opposite sides are equal and parallel, then the figure is parallelogram.

Reason:

In ΔABC and ΔCDA,

 AB = DC Given)

  AC = AC (Common)

 ∠BAC = ∠DCA (Because  AB || CD, Alternate interior angles are equal)

So, by SAS Congruence rule, we have

ΔABC ≅ ΔCDA

Also,

 ∠BCA =∠DAC (Corresponding parts of congruent triangles are equal)

But, these are alternate interior angles, which are equal.

 AD || BC

Thus,  AB || CD and AD || BC

Hence, quadrilateral ABCD is parallelogram

  Is there an error in this question or solution?
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APPEARS IN

RD Sharma Mathematics for Class 9
Chapter 13 Quadrilaterals
Q 14.1 | Page 69
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