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In a regular triangle. (isosceles, right, or acute), the interior angles always add up to 180 degrees because in simplest terms, a triangle is basically a line that has been folded into three sections and every line is equivalent to 180 degrees. However... there are technically triangles that have interior angles that do not add up to 180 degrees! A pseudosphere is a triangle that is essentially "drawn" on a sphere resulting in each of the sides being curved. The interior angles of a pseudosphere actually add up to more than 180 degrees.
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The sum of the interior angle measures of an octagon?
To find interior angle measurements, you must divide the shape into triangles by drawing diagonal lines. The diagonal lines draw triangles, and the interior angle measure of triangles are always 180 degrees. The sum of interior angles of an octagon is 1080 degrees. How ever many triangles you have, multiply it by 180. See octagons in the link for more help,
What triangles have a 45 degree angle?
acute triangles
Is a triangle always perpendicular?
No, not all triangles have a 90 degree angle, so not all are perpendicular.
Are the exterior angles of a scalene triangle always obtuse?
No, they are not always obtuse, because a scalene triangle can also sometimes be an obtuse triangle (meaning that one interior angle is obtuse), making one exterior angle acute. Scalene triangles also can be a right triangles (meaning that one interior angle is a right angle), which would make an exterior angle a right angle. Then also they can be acute triangles, in this case all 3 exterior angles are obtuse.
What are the angle measures of a 100 degree triangle?
Not possible because all triangles have a total sum of 180 degrees interior angles.
