What is the radius of a 18 inch circle

To find the radius, then, we insert 18 in for the circumference. So 18=2∏r. Solving for r gives 9/∏, or approximately 2.86 inches.

What is the radius if the diameter is 18?

Therefore, if diameter is 18, then radius is half of 18, which is 9 cm.

What is the radius of an 18 cm circle?

What is the radius of the circle if the circumference is 18cm? – Quora. Therefore, the radius of the circle = 2.86 cm.

What's the circumference of an 18 inch circle?

2 Answers. The answer is 56.57 .

How do we find the radius of a circle?

1. When the diameter is known, the formula is Radius = Diameter/ 2.
2. When the circumference is known, the formula is Radius = Circumference/2π.
3. When the area is known, the formula for the radius is Radius = ⎷(Area of the circle/π).

What is the radius of 18 ft?

Dean R. The diameter is twice the radius, so would be 36 feet.

What is the radius and diameter of the following circle 18?

If r = 18 inches, then D = 2(18) = 36 inches.

What is the radius of a circle if the circumference is 18 pi?

Therefore, 2πr=18π cm(cancelling π from both the sides). 2r=18; so r=18/2 cm=9cm. Answer.

What is the radius of a circle answer?

radius is always half the length of its diameter. For example, if the diameter is 4 cm, the radius equals 4 cm ÷ 2 = 2 cm.

What is the radius and diameter of 18 cm?

Since diameter is the distance across the center of a circle, and radius is the distance from the center of the circle to the outer edge, radius is half the diameter. Therefore, if the diameter is 18cm the radius is 9 cm.

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What is the radius and diameter of the circle?

While the radius of a circle runs from its center to its edge, the diameter runs from edge to edge and cuts through the center. … Radius and diameter are close friends – a circle’s radius is half the length of its diameter (or: a circle’s diameter is twice the length of its radius).

How many square inches are in an 18 inch circle?

For example, if you have a 18 inch radius, you would multiply 18 inches by 18 inches to get 324 square inches.

How do I find the radius of a circle from the area?

To find the radius, divide the area by pi, then take the square root.

What is a circle diameter?

The diameter is the length of the line through the center that touches two points on the edge of the circle.

How do you convert square feet to radius?

Multiply the radius by itself to square the number (6 x 6 = 36). Multiply the result by pi (use the button on the calculator) or 3.14159 (36 x 3.14159 = 113.1). The result is the area of the circle in square feet–113.1 square feet.

How many SF are in a circle?

How to find the square footage of a circle. Measure the diameter of your circle in feet. Divide your diameter by 2 and then square it (multiply it by itself).

What is a radius of a circle class 9?

The radius of a circle is the length of the line from the centre to any point on its edge.

What is the radius of this circle if the circumference is 18 pi cm C 18 pi cm?

1 Expert Answer So the radius is 9 and since diameter is 2 times the radius then the diameter is 18.

How do you find the radius from the circumference calculator?

1. Divide the circumference by π, or 3.14 for an estimation. The result is the circle’s diameter.
2. Divide the diameter by 2.
3. There you go, you found the circle’s radius.

What is the radius of a circle if the circumference is 36pi?

r=36^(1/2)=6. hence, radius is 6.

What is the radius and diameter of the following circle 11 cm?

We know that r = D/2 = (11/2)=5.5 cm answer. the radius of a circle is half the diameter . therefore , the radius of an eleven cm diameter circle is . 11÷ 2 = 5.5 cms .

What is the radius of a circle 12 cm?

So, if d=12 cm, r=12(12)=122=6 cm.

What is the radius and diameter of the following circle 16?

If the 16 cm is the diameter then the radius is 8 cm.

How do you find the diameter of a circle without the radius?

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. Then, you can just multiply the radius by 2 to find the circle’s diameter.

How do you find the radius with the 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.

How do you find the inches of a circle?

You can calculate the circle’s circumference in inches with pi in the equations circumference = 2 * radius * pi and circumference = diameter * pi.

How do you find the diameter in inches?

Divide the circumference by pi, approximately 3.14, to calculate the diameter of the circle. For example, if the circumference equals 56.52 inches, divide 56.52 by 3.14 to get a diameter of 18 inches.

Is the diameter half the radius?

The radius of a circle is the length of the line segment from the center of a circle to a point on the circumference of the circle and diameter is a line segment from one end of the circle to the other end of the circle passing through the center of the circle. So, the radius is half the length of the diameter.