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This is approximate.

level of precision.

Your calculator will just give you an approximation.

One, you say, well this is an approximation.

Would you move my umbrella?

So it would be that distance plus that distance plus that distance plus that distance.

This magenta distance minus this light blue distance.

This distance squared plus this distance squared is going to equal that distance squared.

So if this distance is the same as this distance, then the magenta distance minus this blue distance is going to be equal to this green distance.

Figures have been rounded off.

Not exactly, but that's a pretty good approximation.

And now we're getting pretty close we can zoom in on this triangle down here.

Can you bring government closer to people?

Roughly 100. That's rough enough.

This distance is the same distance as this distance right there.

So that distance is the same as that distance.

This distance is the distance squared.

This distance is going to be equal to that distance.

That this distance plus this distance over here, is going to be equal to some constant number.

This distance right here is 3, this distance right here is 3, this distance right here is 2, this distance right here is 2.

That's 4,099, rounding a bit.

We're going to round down to 40.

The nearest ten is 30.

And we learned that the focus, the focal distance or the distance from the central of the ellipse, which is this distance right here that focal distance is just the square root of the difference of these two numbers.

And so if this is at distance 0, we could call this distance out here distance d.

That this distance is equal to this distance

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So this distance is going to be a radius, this distance right over here is going to be a radius, and this distance right over here is going to be a radius

Floating point numbers are approximations to real numbers.

We want to round the numbers first and then multiply.

So if we want to round, and really we just have two places here, so if we're going to round anything, it's going to be to the nearest ten because that's the largest place we have.

This distance right over is 12 5 and this distance over here is also 12 5

In this circumstance, what does distance represent?

So this distance right here is going to be 5, and so will this distance.

Well, what's the sum of this plus this green distance?

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