Q: What is the external angle if the internal angle is 135 degree?

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The external angle of a polygon is equal to 360/n, n representing the number of sides in the polygon. Since an octagon has eight sides, the external angle of a regular octagon is 360/8 = 45 degrees. Since a straight angle in a polygon would be equal to 180 degrees, you subtract the measure of the external angle from this, to make an internal angle of 180 - 45 = 135 degrees.

obtuse

the completment of a 65 degree angle is 130

The supplement of 45 degrees is 135 degrees.

Each of the internal angles on a regular octagon measures 135 degrees.

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The external angle of a regular octagon is 225 degrees. Each internal angle of a regular octagon is 135 degrees.

An angle of 159 degrees is an obtuse angle

The number of sides of a regular polygon is 360 divided by the size of the exterior angle. The external angle is 180 - the internal angle. So for a regular polygon with an internal angle of 135 we get the following. 360 / (180 - 135) = 360 / 45 = 8 sides

Do 180-135 and you will get your answer.

right

Cut a 45 degree angle "going the other way".

you will have to construct a 135 degree angle first...but constructing a 90 degree with a 45 degree to give u the 135 degree angle and then using that as a reference, u will have to draw a 60 degree angle going counter clockwise from the 135 degree angle so that 135-60=55 degree...hahah I know it is confusing but if only i could show you...cz i mean visual is better than oral right !??! haha ^D^... hope i can help....

It is: 45 degrees

It is: 45 degrees

The external angle of a polygon is equal to 360/n, n representing the number of sides in the polygon. Since an octagon has eight sides, the external angle of a regular octagon is 360/8 = 45 degrees. Since a straight angle in a polygon would be equal to 180 degrees, you subtract the measure of the external angle from this, to make an internal angle of 180 - 45 = 135 degrees.

As the angle is between 90 degrees and 180 degrees, it an obtuse angle.

obtuse