3 years ago

Is parallelogram ABCD a rectangle?

Mathematics

1 answer:

Fantom [35]3 years ago

6 0

Answer:

Step-by-step explanation:

Sides AB to DC aren't congruent/parallel

Sides BC to AD aren't congruent/parallel

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The ratio of a number and 18 is equal to the difference of a number squared and 5

boyakko [2]

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The number is 2.26

Step-by-step explanation:

Let The given numbers be x

Now according to question :

x : 18 = x² - 5

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or, x = 18 × x² - 90

or, 18 x² - x - 90 = 0

Or, From quadratic equation , the value of x

x = $\frac{-b\pm \sqrt{b^{2}-4\times a\times c}}{2\times a}$

Or, x = $\frac{+\pm \sqrt{-1^{2}-4\times 18\times -90}}{2\times 18}$

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So, x = $\frac{1\pm 80.50}{36}$

∴ x = $\frac{81.50}{36}$ = 2.26

Hence The number is 2.26 Answer

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