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Plane Geometry Videos 30 videos

ACT Math 1.5 Plane Geometry
297 Views

ACT Math: Plane Geometry Drill 1, Problem 5. If two polygons have the same shape and size, they are what?

ACT Math 3.5 Plane Geometry
394 Views

ACT Math: Plane Geometry Drill 3, Problem 5. How long would it take for the wheel to make two rotations?

ACT Math 4.3 Plane Geometry
361 Views

ACT Math: Plane Geometry Drill 4, Problem 3. What is the measure of each angle in the figure?

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ACT Math 5.4 Plane Geometry 294 Views


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Description:

ACT Math: Plane Geometry Drill 5, Problem 4. What is the radius and coordinate center of the circle?

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Transcript

00:02

Here's your shmoop du jour.

00:05

What is the radius and coordinate center of the circle: 25 = (x - 2) squared + (y + 2) squared?

00:15

And here are your options...

00:19

OK, here's the deal. When a circle is expressed in the form of the formula above, the radius

00:25

is always the square root of the integer to the left...

00:29

that means that the radius is the square root of 25, which is 5.

00:34

And the coordinates of the center are the numbers in the x and y parentheses.

00:38

The trick for the coordinates is that you have to flip around the positives and negatives

00:42

from what's in the parentheses. Since the circle here has x minus two and

00:50

y plus two, the coordinates are positive 2 and negative two.

00:55

So our answer is just B.

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