A set of points in a plane, equidistant to a given point
100
What is true about the radii of a given circle?
All radii in a circle are congruent.
100
What is the difference between a common internal and external tangent to a pair of circles?
Internal crosses through the imaginary line that connects the centers of the circles.
200
Define a tangent line
A line in the same plane of a circle that intersects the circle in one and only one point.
200
True or false: A secant is a line segment that intersects the circle at two points,
False: it is a line not a line segment.
200
True or false: If two spheres are concentric spheres, than a line tangent to the first sphere will be tangent to the second.
False
300
Define a semicircle
An arc that joins the endpoints of a diameter.
300
What is known about two segments tangent to a circle from the same point?
The tangent segments are congruent.
300
An equilateral triangle is drawn tangent to a circle. The radius of the circle is 11 cm and the two closest vertices of the triangle to the circle are 61 cm away from the circle's center. What is the perimeter of the triangle?
180 cm
400
Define concentric circles
Concentric circles are coplanar circles with the same center.
400
Finish the theorem: If a line is perpendicular to a radius of a circle at a point on the circle, then the line is __________________________.
tangent to the circle.
400
How many common tangents can be drawn to two tangent circles?
3
500
Define tangent circles
Two coplanar circles that intersect at exactly one point.
500
Finish the theorem:The measure of an arc formed by two adjacent arcs is ....