The circumference of a circle is 6.28 yards. What is the circles area

Mathematics

2 answers:

Nuetrik [128]3 years ago

8 0

Answer:

Step-by-step explanation:

circumference=2πr=6.28

r=6.28/2π=3.14/π=3.14/3.14=1

area=πr^2=π×1²=π=3.14 units²

Ahat [919]3 years ago

8 0

Answer:3.14

Step-by-step explanation:

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notka56 [123]

Answer:

$f(x) = x + 2x^\frac{3}{2} + 5$

Step-by-step explanation:

I'm assuming the question here is asking for f(x)

The first step would be to find the antiderivative of f'(x)

$\int{1+3\sqrt{x}} \, dx = \int{1 + 3x^\frac{1}{2}} dx$

Apply the reverse power rule

$x + 2x^\frac{3}{2} + C$

Now solve for C when x = 9

$x + 2x^\frac{3}{2} + C = 68\\9 + 2(9)^\frac{3}{2} + C = 68\\9 + 2(27) + C = 68\\9 + 54 + C = 68\\63 + C = 68\\C = 5$

Now substitute into the antiderivative

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3 years ago

Suppose someone tells you that she has a triangle with sides having lengths 2.6, 8.1, and 8.6. Is this a right triangle? Why or

Elodia [21]

First you check for Pythagoras' Theorem.

Is 8.6² = 8.1² + 2.6² ?

8.1² + 2.6² = 65.61 + 6.76 = 72.37
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8.1² + 2.6² ≠ 8.6²

Since Pythagoras' Theorem is not satisfied it is not a right angled triangle.

The longest side is 8.6, let's find the angle facing the longest side 8.6.

By cosine formula CosA = (b² + c² - a²) / (2bc)

CosA = (2.6² + 8.1² - 8.6²) / (2*2.6*8.1) = -1.59/42.12 = -0.0377

A = Cos inverse (-0.0377) = 92.1 degrees

So there is an angle is greater than 90 degrees.

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3 years ago

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Inessa05 [86]

Answer:

1/5

Step-by-step explanation:

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3 years ago

The manager of a store increases the price of a popular product by 5%. Let t be the original price of the product. The new price

valentinak56 [21]

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