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jenyasd209 [6]
3 years ago
6

The semi-circle has a diameter of 8. What is the perimeter of the semi-circle?​

Mathematics
2 answers:
skad [1K]3 years ago
6 0

Answer:

roughly 12.56 units

Step-by-step explanation:

Since the perimeter of a circle is 2*pi*r, we can divide it by two or multiply by half in order to find the perimeter of a semicircle

half of the diameter is the radius, so 8/2 =4, r=4

Plug in what we know...

C=2*pi*4

Solve

2*3.14*4

25.12

divide by 2

25.12/2=12.56

12.56 units is the perimeter

morpeh [17]3 years ago
3 0

Answer:

Approx. 20.566 units

Step-by-step explanation:

Find the circumference of the whole circle first by doing:

C = 2πr

r = 4 (8 divided by 2)

C ≈ 25.133

Then divide that by two because a semi-circle is half a circle:

12.566

Then add 8 (diameter) to that number for the open side.

Hope this helps :)

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Express the answer in standard form.​
Natali [406]

Answer:

-2x^{2} +8x-10

Step-by-step explanation:

Standard form is basically where the degrees of the terms are in descending order.

First, let's distribute the negative sign to the terms in the second parentheses:

-(3x^{2} -5x+3) = -3x^{2} +5x-3

Now, we can just combine like terms with the terms from the first parentheses:

x^{2} +3x - 7 - 3x^{2} +5x-3 = -2x^{2} +8x-10

So, our answer is: -2x^{2} +8x-10

8 0
2 years ago
Read 2 more answers
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sergeinik [125]

Answer:

1/3

Step-by-step explanation:

The only way it could be less than 9 is if the second cube is either 1 or 2. The probability of either of those outcomes is 2/6, simplified to be 1/3

4 0
3 years ago
A spinner is divided into five colored sections that are not of equal size: red, blue,
pashok25 [27]

Answer:

0.67

Step-by-step explanation:

The total number of spins is

7 + 13 + 20 + 14 + 9 = 63

The numbers of spins that landed on blue, green, and purple are:

13, 20, 9

Total blue, green, purple: 13 + 20 + 9 = 42

Based on the spins that are tabulated, the probability the spinner will land on blue, green, or purple is

42/63 = 2/3 = 0.67

3 0
2 years ago
Which statements are true about reflections? Check all that apply.
maria [59]

Answer:

A, B, C, D, F

Step-by-step explanation:

<em>A. An image created by a reflection will always be congruent to its pre-image. </em>

Congruent means identical or similar. The orientation, size, and shape of the pre-image are not changed after a reflection- therefore, the pre-image and image are congruent.

<em>B. An image and its pre-image are always the same distance from the line of reflection.</em>

When a pre-image is flipped across the line of reflection, both figures are perfectly symmetrical. Nothing has changed aside from orientation and location on the graph. The number of units between the figures and the line of reflection should remain unchanged.

<em>C. If a point on the pre-image lies on the line of reflection, the image of that point is the same as the pre-image.</em>

When you reflect a pre-image with a point that lies on the line of reflection, that point will stay on the line of the reflection as the rest of the figure is flipped.

I will explain these two answers together since they have similar explanations.

<em>D. The line of reflection is perpendicular to the line segments connecting corresponding vertices.</em>

<em>F. The line segments connecting corresponding vertices are all parallel to each other.</em>

In a reflection, the horizontal or vertical (depending on the line of reflection, y-axis or x-axis) coordinates are altered. However, if one were to draw an imaginary line connecting the corresponding vertices, both the image and pre-image are parallel and perpendicular.

I hope this helped, good luck on your work/test!

7 0
2 years ago
Hep meh plz!!!!!!!!!!!!! 25 points
Makovka662 [10]
D. X=10 all you have to do is pick an answer and plug it in
8 0
3 years ago
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