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blsea [12.9K]
2 years ago
9

I NEED HELP ASAP

Mathematics
2 answers:
astraxan [27]2 years ago
3 0

area of a square = s²

s² = 196

s = √196

therefore s = 14cm

hope it helps...!!!

Ostrovityanka [42]2 years ago
3 0

Answer:

D. 14

Step-by-step explanation:

14 x 14

= 196

Hope it helps :))

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Answer:

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Step-by-step explanation:

We know that the permiter is defined as

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Where L is the longest side, S is the smallest and M is the middle side.

If L=x then, S=x-20, where we need to find an expression for M using the law of cosines.

M^{2} =L^{2}+S^{2}-2 \times L \times S \times cos(60\°)\\M=\sqrt{x^{2}+(x-20)^{2}-x(x-20)}\\M=\sqrt{x^{2} +x^{2}-40x+400-x^{2}+20x}=\sqrt{x^{2}-20x+400}

Replacing all expression, the perimeter is

P=x+x-20+\sqrt{x^{2}-20x+400}\\P=2x-20+\sqrt{x^{2}-20x+400}

Using a calculator, the perimeter is 20 units centimeters.

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Step-by-step explanation:

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