3 years ago

I need the answer as soon a possible

Mathematics

1 answer:

elena-s [515]3 years ago

8 0

Answer:

$x = 0 \\ 7y = 28 \\ y = 28 \div 7 = 4 \\ \\ \\ y = 0 \\ - 4x = 28 \\ x = 28 \div ( - 4) = - 7$

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a pair of adjacent side of a rectangle are in the ratio 3 : 4 if its diagonal is 20 cm find the length of sides and hence the pe

lutik1710 [3]

Answer:

Step-by-step explanation:

Ratio=3:4

so,the pair of adjacent sides are 3x,4x

Pythagorean theorem,

$(3x)^{2}+(4x)^{2}=20^{2}\\9x^{2}+16x^{2}=400\\\\25x^{2}=400\\\\x^{2}=\frac{400}{25}\\\\ x^{2}=16\\\\x=\sqrt{16}\\\\x=4\\\\length=4x=4*4=16cm\\\\breadth=3x=3*4=12cm\\\\Perimeter=2*(l+b)\\\\=2*(16+12)=2*28\\\\=56cm$

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3 years ago

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makkiz [27]

Answer:

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Step-by-step explanation:

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3 years ago

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Gnoma [55]

Let's say

P = perimeter, L : Length and w : width

Then

$P=2(L+w)=2L+2w=108$

But

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So

$2L+2w=108\\2(6+2w)+2w=108\\12+4w+2w=108\\12+6w=108\\6w=108-12\\6w=96\\w=16$

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We verify :

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3 years ago

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