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What is the name for the measurement of the outside edge of a circle?
The measurement of the outside edge of a circle is known as the circumference.
What is the center and edge of a circle called?
The centre of a circle is simply called the cnetre. The edge may called the perimeter, the circumference or the edge.
What is a circumference in math?
The length of the edge of a circle.
What is the radius of circle?
The radius of a circle or sphere is a straight line from the centre to the edge.
What happens between a radius and a tangent in a circle?
A tangent is always perpendicular to the radius of a circle. A radius is a straight line going from the center of the circle to the circumference (edge) of the circle. A tangent is a straight line outside the circle that touched the circle at one (and only one) point. When a tangent touches the outside edge of the circle at the same point where a radius touches the edge of the circle, the angle between the radius and tangent line is 90 degrees meaning they are perpendicular.
