How Do You Find The Circumference If You Know The Radius?

1. Multiply the radius by 2 to get the diameter.
2. Multiply the result by π, or 3.14 for an estimation.
3. That's it; you found the circumference of the circle.

How do you find circumference with radius?

1. Multiply the radius by 2 to get the diameter.
2. Multiply the result by π, or 3.14 for an estimation.
3. That's it; you found the circumference of the circle.

What is the circumference when the radius is 12?

The formula for the circumference of a circle is C = 2πr, so the circumference of this circle can be represented by C = 2π(12). This simplifies to C =

24π

. If we use 3.14 for π, then C = 24(3.14) = 75.36 inches.

What is the radius of 12 cm?

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

6 cm

.

What is the area of the radius is 12?

First you need to find the radius, the key term to find the radius is diameter=2⋅radius ; therefore the radius r is 122=6 inches. To find the area of a circle, you need to use the formula A=

π⋅r2

; therefore the area A is π⋅62≈113 square inches.

What is the area of a circle if the radius is 13 cm?

The area of a circle is

pi times the radius squared (A = π r2)

. Learn how to use this formula to find the area of a circle when given the diameter.

What is the area of 12 cm diameter?

The area of a circle is equal to

Pi π

times the radius r squared. Substitute in the value of the radius r=12 into the formula for the area of a circle. Pi π is approximately equal to 3.14 .

How do you find the radius?

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

What's the area of the radius is 14?

The area is

196π

, or 615.752160 when evaluated to 6 decimal places.

What is the area of the radius is 3?

Radius of a circle = 3 cm. The area of that circle. r = Radius. therefore∴ The Area of the circle is

28.26 cm2

.

What is the area of 6 radius?

A = πr

²


, where r is the radius of the circle …. Thus, after rounding off the answer to one decimal point, the area of the circle is 113.1 ft

²

(answer choice D).

What is the circumference if the diameter is 13?

What is the area of the circumference is 13?

The area of a circle is

pi times the radius squared (A = π r2)

. Learn how to use this formula to find the area of a circle when given the diameter.

What is the radius of 18cm?

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

.

How do you draw a circle with diameter of 12 cm?

1. i) Draw a line segment AB = 12 cm.
2. ii) Draw a circle with centre O and AB as diameter.
3. iii) From O, take a point P such that OP = 10 cm.
4. iv) Bisect OP and draw another circle with OP as diameter which intersects the given circle at T and S.
5. v) Join TP and SP.
6. TP and SP are the required tangents.

What is the diameter of a radius?

Radius is the length of the line segment from the center of the circle to an endpoint on the circle and diameter is twice the length of the radius of the circle. Using this definition, the formula for the diameter is:

D = Radius × 2.