# What is the diameter of a 20cm circle?

Circles (basic)
Diameter Circumference(approx) Circumference
20 cm 60 cm 62.8cm
40 cm 120 cm 125.6cm
3m 9m 9.42m
5 cm 15.7 cm 15.7cm

In respect to this, how do you figure the diameter of a circle?

To calculate the diameter of a circle, multiply the radius by 2. If you don’t have the radius, divide the circumference of the circle by π to get the diameter. If you don’t have the radius or the circumference, divide the area of the circle by π and then find that number’s square root to get the radius.

Furthermore, what is the circumference of a 20 foot diameter circle? Circumference = 62.857 ft. Answer: the circumference of the circle having 20 ft diameter is 62.857 ft.

Hereof, what is the diameter of a 10cm circle?

Diameter is the longest line that you can draw in a circle passing through the centre of the circle. Radius is the line joining the centre of the circle to any point on the circumference. Answer: the radius of 10 cm diameter circle is 5 cm.

What is the circumference of a 12 inch diameter circle?

Circumference & Areas

Size in Inches Circumference Inches Area in Square Inches
12 37.700 144.000
12 1/4 38.480 150.060
12 1/2 39.270 156.250
12 3/4 40.060 162.560

### What is the diameter of a round table?

What sizes do circular tables come in? Round tables range in size from two person tables with diameters of 2’6” | 76 cm, to 12 person tables with 8′ | 244 cm diameters.

### What is the area of an 8 inch circle?

Area of a 8 Inch Circle
201.06 square inches
1.3963 square feet
0.12972 square meters
1,297.2 square centimeters

### How do you find the inner diameter from the outside diameter?

Subtract the inside diameter from the outside diameter of the pipe. The result is the combined thickness of the pipe walls on both sides of the pipe. For example, if the outside diameter is 6 inches and the inside diameter is 5 inches, the combined size of the opposite pipe walls is 1 inch.

### What is a radius of a circle?

The radius of a circle is the distance from the center of the circle to any point on its circumference.  The easiest way to find the radius is by dividing the diameter in half.

### What is the diameter of an 8 inch circle?

The circumference of a circle that has a diameter of 8 inches is 25.12 inches.

### What is the diameter of a 12 inch circle?

So if the radius of the circle is 12“, then the area “A” is (approximately) 3.14 * 12^2 or about 3.14 * 144 = 452.16 square inches. If the diameter of the circle is 12“, then the radius is 6″ (half the diameter), and the area “A” is (approximately) 3.14 * 6^2 or about 113.04 sq.

### What is the area of 17cm?

Area of a circle in terms of radius:

r2 = 3.14 × 172 = 907.9 square cm.

### What is the radius of 7cm?

Since the diameter d is equal to 2 times the radius r , the formula for circumference using radius is 2πr 2 π r .

### How do you draw a 10 cm diameter circle?

Step-by-step explanation:
1. Mark a point X on the centre of your page.
2. To draw a circle of diameter 10 cm, we need to first calculate the radius.
3. Radius = diametre/2 = 10/2 = 5 cm.
4. Now, take a compass and open it to 5 cm.
5. Place the needle of the compass on the point marked X and draw a full circle on the page.

### How do I find the length of an arc?

To find arc length, start by dividing the arc’s central angle in degrees by 360. Then, multiply that number by the radius of the circle. Finally, multiply that number by 2 × pi to find the arc length.

### What is the circumference of a 6 cm diameter circle?

What is the circumference of a 6 inch diameter circle? The circumference of a circle is 6.28.

### What is diameter if circumference is known?

Solve the equation for the diameter of the circle, d= C/π. In this example, “d = 12 / 3.14.” or “The diameter is equal to twelve divided by 3.14.” Divide the circumference by pi to get the answer. In this case, the diameter would be 3.82 inches.

### What is pi r2?

Pi r-squared is the formula for the area of a circle of radius r. The lowercase Greek letter pi (written ) stands for the ratio of circumference to diameter, which is the same for all circles because they all have the same shape.

### How do you draw 6 cm in diameter?

How to draw a circle of diameter 6 cm
3. measure 3cm in the rounder.
4. place the pointed end on the paper and draw the circle.
5. The circle drawn will be with diameter of 6 cm.

### Is diameter a chord?

A chord of a circle is a straight line segment whose endpoints both lie on the circle. A chord that passes through a circle’s center point is the circle’s diameter. Every diameter is a chord, but not every chord is a diameter. The word chord is from the Latin chorda meaning bowstring.

### How do you solve for radius and diameter?

Just remember to divide the diameter by two to get the radius. If you were asked to find the radius instead of the diameter, you would simply divide 7 feet by 2 because the radius is one-half the measure of the diameter. The radius of the circle is 3.5 feet. You can also use the circumference and radius equation.

### How do you find the radius and diameter of a circle?

Take the circumference of a circle and divide it by Pi. For example, if the circumference is 12.56, you would divide 12.56 by 3.14159 to get 4, which is the diameter of the circle. Use the diameter to find the radius by dividing the diameter by 2. For example, if the diameter is 4, the radius would be 2.