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Q: Interior and exterior angles of triangles?

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All acute triangles have 3 interior angles and 3 exterior angles. This is true for all triangles.

They are its exterior angles and the 3 exterior angles of a triangle add up to 360 degrees whereas its 3 interior angles add up to 180 degrees.

Yes, equilateral triangles have congruent interior angles, and each of the three interior angles measures 60 degrees.

The exterior and interior angles of each vertex of a polygon add up to 180 degrees.

I'm not sure if you mean interior or exterior angles, so I'll give you an answer for both.For interior angles:The sum of the measures of the *interior* angles of a quadrilateral is always 360 degrees. To understand why this is true, recall that the sum of the interior angles of a triangle is 180 degrees. Now, in any quadrilateral, we can draw a diagonal, splitting it into two triangles.So, the sum of the interior angles of the quadrilateral will be the sum of all of the interior angles of the two triangles, in other words, 2x180.In general, an n-gon can be divided into n-2 triangles, so the sum of the interior angles of an n-gon is 180x(n - 2) = 180xn - 360For exterior angles:The sum of the exterior angles of any closed, convex figure will be 360 degrees. So, if the quadrilateral is convex (isn't bent inwards) the sum of the exterior angles will be 360 as well.

octagon interior=135 exterior=45

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.

Exterior angles: 360 degrees Interior angles: 180 degrees

Interior angles add up to 3960 degrees Exterior angles add up to 360 degrees

Triangles are joined together by 3 line segments Triangles have 3 interior angles that add up to 180 degrees Triangles have 3 exterior angles that add up to 360 degrees Triangles have no diagonals Triangles will tessellate Triangles can be scalene, obtuse, right angle, isosceles or equilateral Triangles have a perimeter which is the sum of their 3 sides

they are angles that are usually parallel and that crossed the line that are oppsite from each other

Interior angles add up to 540 degrees Exterior angles add up to 360 degrees

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