Draw a Circle Using the Line as the Diameter

Download Commodity

Download Article

Need to find the diameter of a circle? Calculating diameter is easy—you just need the radius, the circumference, or the area. Even if you lot don't take whatsoever of those dimensions, you can still detect the diameter if y'all accept a drawing of the circumvolve. Proceed reading to learn all of the different formulas you can use to find the bore of a circle, examples included.

Calculation Help

1. 1

   If you know the radius of the circle, double it to get the diameter. The radius is the distance from the center of the circumvolve to its edge.^[1]

   Case
   If the radius of the circumvolve is iv cm, then the bore of the circle is 4 cm ten 2, or viii cm.

2. 2

   If you know the circumference of the circle, divide it by π to go the diameter.

   π is equal to approximately three.xiv

   but you should apply your calculator to get the virtually authentic results.^[ii]

   Example
   If the circumference of the circle is 10 cm, then the diameter is ten cm/π, or 3.18 cm.

   Advertisement

3. iii

   If you know the area of the circumvolve, divide the result by π and detect its foursquare root to get the radius; and so multiply by two to go the diameter. This goes back to manipulating the formula for finding the area of a circle, A = πrⁱⁱ, to get the bore. You can transform this into r = √(A/π) cm.^[three]

   Case
   If the area of the circle is 25 cm², divide that by π and find the square root.
   This equals cm 2.82cm, so the bore of the circumvolve is 2.82 x 2 = 5.64cm.

   Advertizement

1. 1

   Draw a horizontal line inside the circle from one edge to the other. Use a ruler or a straight edge to exercise this.

   It can be at the top, almost the bottom, or anywhere in between.

2. 2

   Label the points where the line crosses the circumvolve points "A" and "B."

3. 3

   Describe two overlapping circles, one using A as the center and the other using B as the center. Be sure the two circles overlap like a Venn diagram.

4. iv

   Describe a vertical line through the two points at which the outer circles intersect. This line marks the diameter of the circle4.

5. 5

   Measure the diameter.

   Measure information technology using a ruler,

   or for greater accurateness, a pair of digital calipers. Y'all're washed!

   Advertisement

Add New Question

• Question

  What is diference between radius and diameter?

  

  The radius is half the diameter.

• Question

  If I have the circumference, how can I calculate diameter?

  

  Carve up the circumference by pi.

• Question

  The radius of a dinner plate is 6 cm; what is the bore?

  

  Since the radius is half the diameter, to get the diameter, yous'd multiply the six cm by 2. The diameter of this round dinner plate is 12 cm.

• Question

  What is the surface area of a circle?

  

  The surface area of a circle is area=πr2, or pi * the radius squared, brand sure to first square the radius and so multiply that by pi.

• Question

  How exercise I trace a circumvolve with a diameter of 4 cm?

  

  You have a couple options. Observe something that is 4 cm in diameter (or slightly smaller) and draw around it. Use a compass fix to a radius of 2 cm. Use a drawing program and set the circumvolve backdrop so that information technology has a diameter of iv cm. Finally, use metric graph paper and plot the graph of x2 + y2 = 4. (one unit = one cm).

• Question

  How practice I find the area of a circle that has a perimeter of 36 cm?

  

  Split up the circumference (perimeter) by pi. That gives yous the bore. Half of that is the radius. To get the area, square the radius, and then multiply by pi.

• Question

  How do I calculate the circumference of a circle to the bore?

  

  Danoyachtcapt

  Top Answerer

  C = 3.14 10 d

• Question

  What is the diameter of a brawl with a book of 288?

  

  The diameter is equal to the cube root of the post-obit: half dozen times the volume divided past pi.

• Question

  How can I find the coordinates of a diameter?

  

  The diameter is formed from the center of 1 side of a circumvolve to the other, significant that in that location are no coordinates since the bore is always located in the center of the circumvolve.

• Question

  If my radius is 20ft, how can I observe the bore?

  

  Double the radius.

Evidence more than answers

Ask a Question

200 characters left

Include your email address to get a bulletin when this question is answered.

Submit

Advertisement

Video

• Using geometrical formulas and equations gets easier with practice. Enquire for assistance from someone who has worked with circles or any other geometrical figures. You're likely to notice that questions of geometry will seem less challenging with a little experience.

• Familiarize yourself with the utilise of a compass (the drawing tool, not the direction-finder). This is a very useful instrument in many applications, including drawing a circle's diameter, as outlined to a higher place. A divider (an instrument similar to a compass) can sometimes exist used in such cases.^[4]

Thank you for submitting a tip for review!

Ad

Things You'll Need

• Calculator
• Pencil with an eraser
• Compass
• Ruler
• Digital calipers(optional)

About This Article

Article Summary X

To calculate the diameter of a circle, multiply the radius by ii. If you lot don't accept the radius, divide the circumference of the circumvolve by π to get the bore. If you lot don't have the radius or the circumference, split the area of the circle past π so find that number's square root to get the radius. And so, yous can just multiply the radius by 2 to find the circle's diameter. Read the commodity to larn how to calculate the bore of a circle using a ruler!

Did this summary help you?

Thanks to all authors for creating a folio that has been read 3,501,979 times.

Did this commodity help you?

friedmancourel.blogspot.com

Source: https://www.wikihow.com/Calculate-the-Diameter-of-a-Circle

Share this post