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Papessa [141]
3 years ago
11

Which of the following figures has 90 rotation symmetry?

Mathematics
1 answer:
garik1379 [7]3 years ago
6 0
It would be a rectangle
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Divide and write in simplest form 4/7 divided by 1 1/7
IrinaVladis [17]

First, change the mixed fraction into improper fraction

1 1/7 = 7/7 + 1/7 = 8/7

(4/7)/(8/7)

To solve, flip the second fraction, and change the division into multiplication

(4/7)/(8/7) = (4/7) x (7/8)

Multiply, and simplify

(4/7) x (7/8) = 28/56, or 1/2

1/2 is your answer

hope this helps

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If you are facing north. Turn 90 degrees left. Turn 180 degrees right. Reverse direction. Turn 45 degrees left. Reverse directio
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You would be facing southwest
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Write the equation of the circle whose center is (-4,8) and has a diameter of 18
svetoff [14.1K]

Answer:

(x + 4)^2 + (y - 8)^2 = 81

or

(x + 4)^2 + (y - 8)^2 = 9^2 depending on how your teacher wants it written.

Step-by-step explanation:

The standard form for a circle is

(x + h)^2 + (y + k)^2 = r^2

r is the radius.

You are given the diameter

r = d/2

r = 18/2

r = 9

So you already have the right hand side of the equation

(x + h)^2 + (y + k)^2 = 9*2

(x + h)^2 + (y + k)^2 = 81

You basically have h and k as well. They come from the center point.

h = 4

k = - 8

So the equation of the circle (and the answer) is

(x + 4)^2 + (y - 8)^2 = 81

One question remains. Why do the x and y values change signs? If you know what the distance formula is, then what you are finding is the distance r of all points on the circle from the center of the circle.

It is the distance formula that is actually the formula for the circle.

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