So you could imagine an angle where the two rays in that angle form a line.

And an acute angle is an angle

You start by teaching angles an acute angle, a right angle, an obtuse angle, a straight angle.

We know that that angle is supplementary with this angle over here, there outer sides form a straight angle and they are adjacent.

They're adjacent angles, their outer sides form a straight angle.

It's a joint of tubes. You start by teaching angles an acute angle, a right angle, an obtuse angle, a straight angle.

Remove an Angle

Add an Angle

Move an Angle

Show an Angle

Hide an Angle

An acute angle is an angle that is less than 90 degrees.

This means that you have an angle, an angle, and a side.

We haven an angle, a side and an angle, and an angle, a side and an angle, and say, OK, that's enough for us to show that these are congruent triangles.

So let me draw an angle here, so let me, draw an angle.

I could also draw an acute angle maybe an angle that is formed from an intersection of two lines, so this angle would be acute, and so will this angle.

It's an obtuse angle.

All with an angle.

So the measure of angle DBA plus the measure of angle ABC, is equal to 90 degrees, they form a right angle when you add them up.

And just as another point of terminology, that's kind of related to right angles, when you form, when a right angle is formed, the two rays that form the right angle, or the two lines that form that right angle, or the two line segments, are called perpendicular.

We know that angle CBE, and we know that angle DBC are supplementary they are adjacent angles and their outer sides, both angles, form a straight angle over here.

Angle BDC over here, it is an alternate interior angle with this angle right over here with that angle right over there

We know nothing about this angle so it could form any angle but it does have to get to this other side.

The bisector of an angle

It is an inscribed angle.

This is an inscribed angle.

less than an obtuse angle.

Got an angle, Chief? No.

How's that for an angle?

Angle Side Side and they're able to do it because now they can write Right Angle, so it doesn't form that embarassing acronym.

we know that this is DBA right over here we also know that angle DBA and angle DBC are supplementary this angle and this angle are supplementary, their outer sides form a straight angle, they are adjacent so they are supplementary which tells us that angle DBA, this angle right over here, plus angle DBC, this angle over here, is going to be equal to 180 degrees.

An abnormally small angle is known as coxa vara and an abnormally large angle as coxa valga .

SSA, the angle was acute. This is an acute angle right over here.

An angle defined by three points

Construct an angle through this point

Construct an angle at this point

Construct an arc with this angle

50 degrees is an inscribed angle.

I'll draw it at an angle.

let's add an angle like that.

Well, clearly, in this case, angle H right here, this is an obtuse angle.

let's say angle CB what is this, this looks like an F angle CBE.

An object rotated by an angle around a point

And then we have an interesting relationship we have an angle congruent to angle another angle congruent to an angle and then the next side is congruent to the next side over here so pink green side, so pink green side

If they happen to be adjacent then the two outside sides will form a right angle, when you have a right angle the two sides of a right angle are considered to be perpendicular.