welcome to math with Mr Jay [Music] in this video I'm going to cover what a right triangle is now simply put a right triangle is a triangle with a right angle so an angle that measures exactly 90 degrees and that's it it doesn't matter what the other angles are if a triangle has a right angle it's a right triangle now when we take a look at types of triangles or classifying triangles we can classify by either the sides or the angles right triangles are a type of triangle based on the angles so classified by the angles now here are a couple of examples of right triangles and you'll notice a box in the corner of these examples that box represents a 90 degree angle even though we don't see 90 degrees written there we still know it's a 90 degree angle because of that box and a box in the corner is very common as far as showing 90 degree angles and it doesn't have to be a triangle it can be any shape and one last thing I do want to mention as far as right triangles it's only possible to have one right angle in a triangle remember the sum of the angles always equals 180 degrees for triangles so the angles of a triangle always add up to 180 degrees for example number one we have 45 degrees plus 45 degrees Plus 90 degrees that equals 180 degrees and then for number two we have 27 degrees plus 63 degrees Plus 90 degrees that equals 180 degrees as well if we have two 90 degree angles that equals 180 degrees so we can't make a triangle we can't have a third angle so just something to think about and keep in mind so there you have it there's what a right triangle is just remember look at the angles if one of the angles is exactly 90 degrees it's a right triangle I hope that helped thanks so much for watching until next time peace