Triangle Geometry: Is it Possible to Have Two 90-Degree Angles in One Triangle?

Question

Can a triangle have two right angles?

00:00 Can a triangle have 2 right angles?

00:04 Let's mark the triangle's angles as A,B,C

00:12 The sum of angles in a triangle equals 180

00:17 Let's substitute 2 angles of 90° (right angles)

00:29 Let's isolate the remaining angle C

00:35 It turns out it needs to be equal to 0

00:39 There's no such thing as a line with 0 angle, therefore it's impossible

00:43 And that's the solution to the question

The sum of angles in a triangle is 180 degrees. Since two angles of 90 degrees equal 180, a triangle can never have two right angles.