It says a triangle has, at most, one obtuse angle.

He began by assuming, that in triangle ABC, angle A and B are both obtuse.

That's what obtuse means.

You're not that obtuse.

Triangle ABC equals triangle A1B1C1.

There's triangle ABC, which equals triangle A1B1C1.

Triangle

triangle

Triangle

Triangle

Triangle

Triangle

Triangle

Triangle.

So he's saying that angle A and angle B are both obtuse.

Now, this triangle right here is an isosceles triangle.

Patient Triangle.

smooth triangle

Equilateral Triangle

So this top triangle and this bottom triangle are congruent.

Prove that triangle ABD is congruent to to triangle CBD.

So let's focus on triangle ACD Let's focus on that triangle

Select this triangle

Remove a Triangle

Add a Triangle

Move a Triangle

Show a Triangle

Hide a Triangle

Map this triangle

Geometric Isosceles Triangle

Triangle Wipe Effect

That's a triangle.

That same triangle.

This small triangle.

The corolla tube is 2.5 3 mm long with 2 mm wide obtuse lobes.

I wanted to introduce you to are acute angles, right angles, and obtuse angles.

Select the triangle that has to be transformed onto a given triangle...

This is another type of triangle called a 30 60 90 triangle.

We've split this quadrilateral to two triangles triangle ACB and triangle DBC

let's focus on triangle let's focus on triangle A, B, and D

It asks us, if triangle ABC and triangle XYZ are two triangles such that OK, let me draw these two triangle.

Area of a triangle is equal to 1 2 times the base of the triangle times the height of the triangle.

So if we have a triangle, and the triangle has to be a right triangle, which means that one of the three angles in the triangle have to be 90 degrees.

let's say, let me draw another right triangle, that's another right triangle here.

So it's part of this triangle, and it's also part of this triangle.