homework help?

Question

the earth has a radius of 6400km what is the distance round the equator ? help - homework please show working

Answer 1

d = 2*pi*6400

d = 40,212.386 km

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Answer 2

The circumference of a circle is 2 * pi * R where R is the radius of that circle.
Therefore the circumference (equator) of the earth is;

2 * pi * 6400km, i.e.
2 * 3.14159 * 6400 = 40212.39km.

I hope that this helps you.

Answer 3

Assuming that this is a Maths problem (and not a Geography one), we need to find the circumference for a radius of 6400km.

C = 2 x pi x r = 2 x pi x 6400 = 40,212km

However, you should know that the Earth is not of a spherical shape. It is actually flat at the poles and bulges at the equator, so it should be slightly more than the calculated value.

Answer 4

The circumference of circle equals 2*pi *r. So the distance around the equator equals
2 * 22/7 * 6400 = 40229Km

Answer 5

2 x 22/7 x radius. You are looking for the circumference of the circle which is 2(Pi)r

Answer 6

hi Beth,
Circumference = Pi x Diameter

Diameter = 2 x radius

C = Pi x 6400 x 2

C = 40,228.57 km

Answer 7

If you cut the Earth in half at the equator it would look like a circle. Distace round the circle is the circumferance and the formula for a circumferance is 2πr.
2 x 3.142 x 6400 = 40218 kilometres

Answer 8

the equator is the circumference of the earth.
circumference=2 multiply by pi(3.142) multiply by radius(6400km)

Answer 9

think of it like a circle, cut from the earth around the equator. You are given the radius and are asked the circumference.

c=pi*2r

I'll let you plug in the numbers and solve.

Answer 10

C = 2 x pi x r
C = circumference
pi = 3.141592654 ( the limit of my calculator)
r = radius (6400 km)

C = 2 x 3.14. x 6400km
C = 40212.386 km (3 dp).

NB to quote more than 3 d.p. would be trivial. The distance is in kilometers and 3 d.p. takes it to the nearest metre.

Answer 11

Circumference is pi times D so D = 2 x 6400 km =12,800
12,800 x 3.1415 = 40,211.2