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An acute angle is a angle less than 90 degrees
here's three <>^
To prove that two right triangles are similar, all you need to show is that one of them has one acute angle that's equal to one acute angle of the other one.
That's exactly what the box means! That box is there to show that an angle is right, as right angles can have different properties than acute or obtuse angles.
Every minute on a round clock is six degrees. Putting the hands on 12 and 3 (15 minutes) would be a 90 degree angle.