So that is a 90 degree angle, a 90 degree angle and that is a 90 degree angle over there

They have 90 degree angle here and they have 90 degree angle there

This is a 90 degree angle here.

They both have a 90 degree angle.

So we have a 90 degree angle.

And this is our 90 degree angle.

The only way that this would be equal to 180, angle 3 plus angle 4, is if angle 4 were a 90 degree angle, and angle 3 were also a 90 degree angle.

This is a 90 degree angle right here.

This is the 90 degree angle right here.

This is a perfect 90 degree angle by nature.

It intersects this base at a 90 degree angle

This is clearly a right angle, or a 90 degree angle right over here.

So we know that this is a 90 degree angle.

So that means that they intersect at a 90 degree angle.

Perpendicular lines are lines that intersect at a 90 degree angle.

This 90 degree angle kind of opens into this longest side.

This is a 90 degree angle, they do this little square thing there.

And these two adjacent angles make up a 90 degree angle so they must add up to 90 degrees.

And in all cases, the hypotenuse is the side opposite the 90 degree angle.

So the way I drew it right here, this is our 90 degree angle.

You see the diagonals intersect at a 90 degree angle so we've just proved

It would have a 90 degree angle, and its slope would be the negative inverse.

And I know it's the height because they told me it's a 90 degree angle.

It's a 90 degree angle, if you've been exposed to the idea of angles already.

So a right triangle is a triangle that has a 90 degree angle in it.

And you can see from our measure right over here that that gives us a 90 degree angle, which is a very interesting angle that shows up many times in geometry and trigonometry, and there's a special word for a 90 degree angle it is called a right angle.

These are definitely perpendicular, at least line segments, and this would be a 90 degree angle.

And since that is a triangle that has a 90 degree angle, it's a right triangle.

The way you draw a 90 degree angle is you draw a little box like that.

The longest side of the right triangle, or the side that's opposite the 90 degree angle.

And we know that they intersect at a right angle or a 90 degree angle because they gave us this little box here which literally means that the measure of this angle is 90 degrees.

So these two lines, they intersect, but they're not going to intersect at a 90 degree angle.

And remember, the c that we're dealing with right here is the side opposite the 90 degree angle.

A line that is perpendicular to that will not only intersect the line, it will intersect it at a right angle, at a 90 degree angle.

That exterior angle is 90.

Knee chest position Similar to the jackknife except the legs are bent at the knee at a 90 degree angle.

The longest side of a right triangle, the side that is opposite the 90 degree angle, is called the hypotentuse.

90 degree rotation speed

less than 90 degrees you have an acute angle, at 90 degrees you have a right angle,

This function transforms a radian angle to a degree angle.

This function transforms a degree angle to a radian angle.

Well that exterior angle is 90.

It was a right angle, it was a 90 degrees angle

So all of these are true statements here, and these come out of the fact that the angle formed between DB and BC that is a 90 degree angle.

It's got 90 degree corners.