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.
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,
acute triangles
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.
No, not all triangles have a 90 degree angle, so not all are perpendicular.
Not possible because all triangles have a total sum of 180 degrees interior angles.
170 degrees.
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,
Triangles are always 180º when the angles are added up. There is no inside angle verses and outside angle.
acute triangles
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.
No, not all triangles have a 90 degree angle, so not all are perpendicular.
No. But their three interior angles will always add up to 180 degrees.
Not possible because all triangles have a total sum of 180 degrees interior angles.
If a right angle triangle has an interior angle of 30 degrees then the other two angles must be 90 degrees and 60 degrees.
That depends on what type of triangle it is but in general:- 180-interior angle = exterior angle
They are the triangles that contain a 90 degree angle and two acute angles
It does not; if there is no 90 degree angle there is no hypotenuse.