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Cerrena [4.2K]
3 years ago
5

What is the area of a circle with a radius of 4cm

Mathematics
2 answers:
Degger [83]3 years ago
6 0
50.27cm is the answer.
Mademuasel [1]3 years ago
3 0
The area of a circle is always like this: r^2*pi
16*3.14=50.24
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Annie has bag with tiles numbered 1 through 7 in it . In how many orders can she pull 3 tiles out of the bag ?
DaniilM [7]

Answer:

210 ways

Step-by-step explanation:

7×6×5

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What number fall between the square root of 180
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It will fall betwenn the square root of 169 which is 13 and 196 is 14
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The interior angles of a triangle have measures (2x - 5), (4– 1), and 30°
const2013 [10]

Answer: x=26

Step-by-step explanation:

1. Write the equation 2x-5+4x-1+30=180 because all triangle angles add up to 180°

2. Simplify the equation by combining like terms. Write the equation as 6x+24=180

3. Subtract 24 from both sides. Write the equation as 6x=156.

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2 years ago
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Answer:

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5 0
1 year ago
The surface area of a given cone is 1,885.7143 square inches. What is the slang height?
kap26 [50]

Answer:

If r >> h, the slang height of the cone is approximately 23.521 inches.

Step-by-step explanation:

The surface area of a cone (A) is given by this formula:

A = \pi \cdot r^{2} + 2\pi\cdot s

Where:

r - Base radius of the cone, measured in inches.

s - Slant height, measured in inches.

In addition, the slant height is calculated by means of the Pythagorean Theorem:

s = \sqrt{r^{2}+h^{2}}

Where h is the altitude of the cone, measured in inches. If r >> h, then:

s \approx r

And:

A = \pi\cdot r^{2} +2\pi\cdot r

Given that A = 1885.7143\,in^{2}, the following second-order polynomial is obtained:

\pi \cdot r^{2} + 2\pi \cdot r -1885.7143\,in^{2}  = 0

Roots can be found by the Quadratic Formula:

r_{1,2} = \frac{-2\pi \pm \sqrt{4\pi^{2}-4\pi\cdot (-1885.7143)}}{2\pi}

r_{1,2} \approx -1\,in \pm 24.521\,in

r_{1} \approx 23.521\,in \,\wedge\,r_{2}\approx -25.521\,in

As radius is a positive unit, the first root is the only solution that is physically reasonable. Hence, the slang height of the cone is approximately 23.521 inches.

3 0
2 years ago
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