Right angles measures exactly 90 true or false ?

True!

All right angles are 90 degrees
Anything below 90 is an acute angle
Anything above 90 is an obtuse angle

If you have any more questions feel free to ask,
Hope this helps! :3

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .

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