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Remember the general equation for a circle.

C = 2pi r

Algebraically rearrange

r = C / (2 pi)

Ehere

C = 42.1

pi = 3.141592....

Constan '2'

Substitute.

C = 42.1 / ( 2*3.141592....)

C = 6.7 units (nearest tenth).

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The formula for circumference is C = Pi x D where Pi = 3.1416 and D is the diamter. The radius is one-half of the diameter. You can find the radius by applying the formula for circumference and solving for D, then dividing by 2: 42.1 = 3.1416 x D 42.1 ÷ 3.1416 = D 13.4008 = D D ÷ 2 = R 13.4008 ÷ 2 = R 6.7 = R

Q: What is the radius of a circle with circumference of 42.1 round to the nearest tenth?

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47.25

Circumference of a circle = 2*pi*radius or pi*diameter Circumference = 21.67698931 or 21.7 meters to the nearest tenth

-- Multiply (pi) by (diameter of circle)OR-- Multiply (pi) by (2 times radius of circle)-- Then round the product to the nearest whole number.

Radius is the distance from the centre of a circle to the outside The circumference of a circle is the distance round the outside of a circle

You take the radius (or diameter). If radius you times it by two (since it is half of the Diameter) then times the answer by 3.14. If diameter, times the diameter by 3.14. then round the decimals.

Related questions

A circle with a radius of 4 units has a circumference of 25.13 units.

30.46 but round it to the nearest decimal and it will be 30.50

26.7 mm

47.25

It depends on what the "32in" refers to: circumference, diameter, radius.

Circumference of a circle = 2*pi*radius or pi*diameter Circumference = 21.67698931 or 21.7 meters to the nearest tenth

The circumference of a circle with radius of 7 km is 44.0 km (to the nearest tenth), and the area of a circle with radius of 7 km is 153.9 km (to the nearest tenth).C = 2 pi RA = pi R2

-- Multiply (pi) by (diameter of circle)OR-- Multiply (pi) by (2 times radius of circle)-- Then round the product to the nearest whole number.

If you have the radius, then area = pi*r2 which you then round to the nearest hundredth. If you do not know the radius but do know the diameter or circumference, you can calculate the radius. Otherwise you need to measure it.

The circumference of a circle can be calculated using the formula C = 2πr, where r is the radius. Given the radius as 47, the circumference would be C = 2 * 3.14 * 47 = 294.04. Rounding to the nearest hundredth, the circumference is approximately 294.04 units.

Radius is the distance from the centre of a circle to the outside The circumference of a circle is the distance round the outside of a circle

If 34 inches is the radius or diameter of the circle, (or circumference?), it needs to be stated in the question! What is meant by "round circle?"