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Find the Area of a Rhombus, Each Side of Which Measures 20 Cm and One of Whose Diagonals is 24 Cm. - Mathematics

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ConceptArea of a Polygon

Question

Find the area of a rhombus, each side of which measures 20 cm and one of whose diagonals is 24 cm.

Solution

Given: 
Side of the rhombus = 20 cm 
Length of a diagonal = 24 cm
We know: If `d_1` and `d_2` are the lengths of the diagonals of the rhombus, then
side of the rhombus\[= \frac{1}{2}\sqrt{d_1^2 + d_2^2}\]
So, using the given data to find the length of the other diagonal of the rhombus: 
\[20 = \frac{1}{2}\sqrt{{24}^2 + d_2^2}\]
\[40 = \sqrt{{24}^2 + d_2^2}\]
Squaring both sides to get rid of the square root sign: 
\[ {40}^2 = {24}^2 + d_2^2 \]
\[ d_2^2 =1600-576=1024\]
\[ d_2 =\sqrt{1024}=32 cm\]
∴ Area of the rhombus \[=\frac{1}{2}(24 \times 32) = 384 {cm}^2\]

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APPEARS IN

 RD Sharma Solution for Mathematics for Class 8 by R D Sharma (2019-2020 Session) (2017 to Current)
Chapter 20: Mensuration - I (Area of a Trapezium and a Polygon)
Ex. 20.1 | Q: 14 | Page no. 14
Solution Find the Area of a Rhombus, Each Side of Which Measures 20 Cm and One of Whose Diagonals is 24 Cm. Concept: Area of a Polygon.
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