Points
Lines
Planes
Formulas
Definitions
100

What do we call the set of all points?



space



100

What do we call points that lie on the same line?



colinear



100

Planes that do not intersect are called what kind of planes?



parallel



100

What is the measure of an angle that is inscribed in a circle?



1/2 of the intercepted arc



100

What do we call a statement accepted as true without proof?



postulate



200

Two points in space lie in one and only one ____.



line



200

What do we call lines that intersect in a single point?



concurrent lines



200

What do we call set of points in a plane that are a given distance from a point?



circle



200

What is the formula for finding the circumference of a circle?



c=2pir



200

What are the 3 undefined terms in the study of plane geometry?



point, line, plane



300

How many and what kind of points do we need to determine space?



4 noncoplanar points



300

When two lines intersect, they intersect in one and only one _____________.



point



300

What results from the intersection of two distinct planes?



line



300

What is the formula for finding the midpoint of a segment with endpoint coordinates a and b?



m=(a+b)/2



300

What do we call the union of two distinct rays with a common endpoint?



angle



400

A point divides a line into three disjoint sets. What are they?



a point and 2 half-lines



400

What do we call lines that intersect and form an angle measuring 90°?



perpendicular



400

What is the intersection of a secant plane and a sphere?



circle



400

How do you find the measure of an angle formed by two secants that intersect in the interior of a circle?



It is half of the sum of the measures of the intercepted arcs.



400

What do we call the union of three noncollinear points and the line segments connecting them?



triangle



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