cos70=sin20
so angle is 20, because cosA=sin(90-A)
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Acute
The complement of an acute angle A is the angle 90° - A. The complement of 13° is 77°.
An angle that is 47 degrees would be considered an "acute" angle. This is because its measurements do not exceed 90 degrees. Anything above 90 would be considered an "obtuse" angle.
Less than 90 degrees is an acute angle, a 90 degree angle is a right angle, and an angle greater than 90 degrees is called an obtuse angle.
A chevron. Basically, any polygon with an acute angle whose vertex points to the center of the shape.