What is the name of the figure obtained by joining the midpoints of the sides of the rhombus?

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MATHEMATICS>Quadrilaterals>MULTIPLE CHOICE QUESTIONS>Q 17

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The figure obtained by joining the mid-points of the sides of a rhombus, taken in order, is a rectangle.

Explanation:

The Midpoint Theorem states that the segment joining two sides of a triangle at the midpoints of those sides is parallel to the third side and is half the length of the third side.

Join AC, RP and SQ

In ∆ABC,

P is midpoint of AB and Q is midpoint of BC

∴ By midpoint theorem,

PQ ∥ AC and PQ = `1/2`AC  ......(1)

Similarly,

In ∆DAC,

S is midpoint of AD and R is midpoint of CD

∴ By midpoint theorem,

SR ∥ AC and SR = `1/2`AC  ......(2)

From (1) and (2),

PQ ∥ SR and PQ = SR

⇒ PQRS is a parallelogram

ABQS is a parallelogram

⇒ AB = SQ

PBCR is a parallelogram

⇒ BC = PR

⇒ AB = PR  ......[∵ BC = AB, sides of rhombus]

⇒ SQ = PR

∴ Diagonals of the parallelogram are equal.