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ioda
4 years ago
8

Identify the diameter of the disc. HELP ASAP!!

Mathematics
1 answer:
Zigmanuir [339]4 years ago
5 0

Answer:

  9 1/16 in

Step-by-step explanation:

When chords cross, the distances from their point of intersection to the circle have the same product for each chord. For the 9-in chord, those two distances are 4.5 inches. For the diameter, the distances are 4 in and (d-4) in, where d is the diameter of the circle. Then ...

  4.5^2 = 4(d -4)

  d = 4.5^2/4+4 = 9 1/16 . . . . inches

The diameter is 9 1/16 inches.

_____

<em>Comment on the diagram</em>

The fact that the 9-inch chord looks very much like a diameter tells you the actual diameter won't be much different than that. These figures are not always drawn to scale, and are sometimes misleading. However, if the actual diameter were in the neighborhood of 16 inches, the perpendicular bisector shown would need to be about 1.4 inches instead of 4 inches.

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pickupchik [31]

Answer:

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Step-by-step explanation:

Equation:

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You are doing this because both sides on a straight line add up to 180 degrees. The two angles would add up to 180 degrees since they are on the one side of the line.

Simplifying:

(5x+12x) + (1-8) = 180

Add your common variables together; keep in mind that variables are placed before numbers.

Adding:

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Process:

To do this, you are going to simply do the opposite operation for the number without the variable on both sides of the equal sign.

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     + 7    + 7

------------------

17x = 187

-----   ------

17       17

x = 11

You divided by 17 on both sides because you needed to get the x variable by itself. Hope this helped! :)

3 0
3 years ago
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4 years ago
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