40 Degrees is the most common Angle to set slides at.
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The angle of friction is defined as the angle of a plane where a body placed on the plane will start to slide.
the correct answer is 90
A supplementary angle can not be a complementary angle. The complementary angle has 2 angles equal 90... but a supplementary angle is X2 that much (108). * * * * * Nearly correct. 90 x 2 is 180, not 108!
An acute angle is greater than 0 but less than 90 degrees
That is correct