Radius, Across the half of a circle, Diameter, Across the entire circle, Circumference is..., Around the entire circle, Sum of the angles of a triangle, 180 degrees, A circle is _____ (degrees), 360 degrees, Area of a circle formula, A=πr2, Diameter of a circle formula, D=2(r), Radius of a circle formula, R=D/2, A right angle is ____ (degrees)., 90 degrees, An angle less than 90 degrees is called an..., acute angle, The root word "quad" means what number?, 4, The root word "tri" means what number?, 3, Circumference formula, C=2πr

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