Question

The diagonal of a rectangle is 5 cm and one of at sides is 4 cm. Find it's area........
plz reply fast .....which ans satisfy me .....i will mark it a brainliest one....

Answer 1

altitude =( 5×5 )-(4×4)
= 25-16
=9
square root of 9 =3

therefore the area of rectangle = l×b
= 4×3
=12

l = 4 , b= 3

this is your answer....

Answer 2

Solution :

Here, Applying pythaogram theorm:

Let, other side be x cm
$= > {4}^{2} + {x}^{2} = {5}^{2} \\ = > 16 + {x}^{2} = 25 \\ => {x}^{2} = 9 \\ = > x = \sqrt{9} = 3cm$
Now, Area of rectangle= Legth* breadth

= 4*3= 12cm^2

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Hope it helps:)

#Amrit⭐