This is a quadrotor.

So it forms a tetrahedral crystal.

Characteristic of a fourfooted animal.

Sal Khan So this is a quadratic equation, essentially.

Stanley's cousin's in town. We could make it a foursome tonight.

The silicon tetrahedra are held together by the OH group and hydrogen bonding occurs between the hydrogen in the OH and the silicon tetrahedra.

One, two, three, four. These are all quadrilaterals.

You say you've written a string quartet and a piano concerto.

He was also the second tenor of the quartet Kipparikvartetti in the early 1950s.

In that connection, the thrust of my Government apos s efforts has been fourfold

In fact, there could be whole other four dimensional worlds beyond our detection, hidden from us forever by the nature of our perception.

For instance, fly six of them at once. Or why not ten?

There's a Toyota Forerunner on the street in all these places.

It's called a quadrotor because it has four propellers that spin and generate thrust.

Get rid of this sentimental hymn and take a foursquare chorale.

The forewings are 5 6.6 cm (2.2 2.4 in) long.

Between us, we span the ages.

For all we know, there could be four dimensional lifeforms somewhere out there, occasionally poking their heads into our bustling 3D world and wondering what all the fuss is about.

Lynnfield is the code name for a quad core processor from Intel released in September 2009.

So, how far does eternity go?

And out x values go up to 3.

Those years stretch as the years go on.

However, the foursome finished with only five goals as Brazil disappointed as a whole in the tournament.

The algorithms to do this are very similar to what the single quad used to hit the ball back to me.

I'd better stop using those foursyllable words. I won't be working for The Graphic any more.

YR Yeah, two meter span.

The wave of rage extended to Twitter.

Brazil has a coastline 7,500 kilometres long.

Yeah, two meter span.

You can see this is the left extension.

They can stretch. They can tear.

It went for 1,114 miles,

Because the grapes have their roots in the vine,

Let's hope it doesn't.

At one extreme are domestic policies that create no (or very few) spillovers across national borders.

The routes of both our commercial shipping lines and our commercial airlines extend to enormous distances in fact, from the eastern shores of the Pacific to its western shores.

These precedents can be extended.

The city spreads along both sides of these rivers.

Our concerns also extend to the proliferation of conventional weapons.

And we had the lines spanned by that vector.

We're terrible at models that span 80 years.

It operates on GSM quad band frequency 850, 900, 1800 and 1900 MHz, with automatic switching between frequencies.

The way you can think about it, with the 4 sided quadrilateral is, we already know about this the measures of the interior angles of a triangle add up to 180 so maybe we can divide this into 2 triangles

Compare this to Alice generating a 20 digit pseudorandom sequence using a 4 digit random seed.

Four wheeled motorbikes (quadbikes) are now a common mode of transport, as all roads are unpaved.