MTS 21 25-07-2022 Shift 1


Question 1

If the sum of the diagonals of a rhombus is L and the perimeter is 4P. find the area of the rhombus?
 

यदि एक समचतुर्भुज के विकर्णों का योग L है और परिमाप 4P है। समचतुर्भुज का क्षेत्रफल ज्ञात कीजिए?


Options

A

B

C

D


Solution:

Correct Answer:

C


Let's assume that the diagonals of a rhombus are D and d.

So the area of the rhombus =  12\frac12 ×\times Dd

As per question D + d = L and perimeter of rhombus = 4P

So side of rhombus = P

we also know 14\frac14 ( D2+ d) = P2

( D2+ d) = 4P2

D + d = L so D2 + d2 + 2Dd = L2

Now we can say that Area of rhombus = 12\frac12 ×\times Dd = 14\frac14 ×\times (L2 - 4P2)

माना की समचतुर्भुज के विकर्ण D और d है।

समचतुर्भुज का क्षेत्रफल =  12\frac12 ×\times Dd

प्रशन के अनुसार  D + d = L और समचतुर्भुज का परिमाप = 4P

समचतुर्भुज की भुजा = P

हम जानते है की  14\frac14 ( D2+ d) = P2

( D2+ d) = 4P2

D + d = L so D2 + d2 + 2Dd = L2

अब हम कह सकते है की समचतुर्भुज का क्षेत्रफल  = 12\frac12 ×\times Dd = 14\frac14 ×\times (L2 - 4P2)

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