Points Lines & Angles Flashcards
9 cards from real Geometry practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 9 Points Lines & Angles flashcards as text
What is a point in geometry?
Answer: An exact position with no size
In geometry, a point is a fundamental concept representing an exact position or location in space. It has no dimensions—no length, width, or depth—and is typically denoted by a dot. Points are the building blocks for all other geometric figures.
What defines a line in geometry?
Answer: A straight figure extending infinitely
A line in geometry is defined as a straight figure that extends infinitely in two opposite directions. It is one-dimensional, possessing length but no width or depth. A line can be determined by any two distinct points.
What is an angle?
Answer: Two rays sharing a common endpoint
An angle is formed when two rays share a common endpoint, known as the vertex. The two rays are called the sides of the angle. Angles are typically measured in degrees or radians and represent the amount of rotation between the two rays.
What is the measure of a right angle?
Answer: 90 degrees
A right angle is a specific type of angle that measures exactly 90 degrees. It is formed when two lines or rays are perpendicular to each other. Right angles are fundamental in geometry and are often indicated by a small square symbol at the vertex.
What describes parallel lines?
Answer: Lines that never meet and remain equidistant
Parallel lines are two or more lines that lie in the same plane and never intersect, no matter how far they are extended. A key characteristic is that they maintain a constant, equidistant separation from each other. This property makes them crucial in various geometric constructions and real-world applications.
What defines a perpendicular relationship between two lines?
Answer: They intersect at a right angle
A perpendicular relationship between two lines means they intersect each other at a precise 90-degree angle. This creates four right angles at their point of intersection. Perpendicular lines are fundamental in constructing squares, rectangles, and other right-angled figures.
Which angle is less than 90 degrees?
Answer: Acute angle
An acute angle is defined as an angle that measures less than 90 degrees. It is 'sharp' or 'small' compared to a right angle. For example, angles measuring 30, 45, or 89 degrees are all acute angles.
What is an obtuse angle?
Answer: More than 90 degrees but less than 180 degrees
An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees. It is 'wide' or 'blunt' compared to a right angle. For instance, angles of 100, 135, or 170 degrees are all considered obtuse.
What is the total measure of a straight angle?
Answer: 180 degrees
A straight angle is an angle that measures exactly 180 degrees. When two rays form a straight angle, they point in opposite directions, creating a straight line. It essentially represents half of a full rotation.