Point — definition?
A precise location with no size.
Line — role?
Extends infinitely in both directions.
Plane — function?
A flat surface extending infinitely.
Ray — description?
Starts at a point and extends infinitely in one direction.
Line segment — meaning?
Part of a line between two endpoints.
Angle — formed by?
Two rays sharing a vertex.
Acute angle — measure?
Less than 90°.
Right angle — measure?
Exactly 90°.
Obtuse angle — measure?
More than 90°, less than 180°.
Straight angle — measure?
Exactly 180°.
Complementary angles — sum?
Add up to 90°.
Supplementary angles — sum?
Add up to 180°.
Vertical angles — property?
Always equal when two lines intersect.
Parallel lines — create?
Corresponding, alternate interior, and consecutive interior angles.
Triangle types — examples?
Equilateral, isosceles, scalene.
Triangle inequality — states?
Sum of two sides > third side.
Test your knowledge with 8 questions on Fundamentals of Geometric Concepts and Properties.
1. What is a 'Type of Basic Problem' in geometry?
2. Who is credited with formalizing the basic concepts of points, lines, and planes in geometry?
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