## Questions and Answers

What is a point in space?

A set of coordinates (x, y, z) with no size, only position

What is a line defined by?

Two points or a point and a slope

What is an angle?

A figure formed by two rays sharing a common endpoint (vertex)

What is a triangle?

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What is a quadrilateral?

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What is a circle?

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What is the center of a circle?

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What is the radius of a circle?

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What type of angle is greater than 180 degrees but less than 360 degrees?

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What type of triangle has one right angle (90 degrees)?

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## Study Notes

### Points

- A point is a location in space, represented by a set of coordinates (x, y, z)
- It has no size, only position

### Lines

- A line is a set of points extending infinitely in two directions
- It can be defined by two points or a point and a slope
- Line properties:
- Collinear points: points that lie on the same line
- Intersecting lines: lines that share a common point
- Parallel lines: lines that never intersect, always the same distance apart
- Perpendicular lines: lines that intersect at a 90-degree angle

### Angles

- An angle is formed by two rays sharing a common endpoint (vertex)
- Angle properties:
- Acute angle: less than 90 degrees
- Right angle: exactly 90 degrees
- Obtuse angle: greater than 90 degrees but less than 180 degrees
- Straight angle: exactly 180 degrees
- Reflex angle: greater than 180 degrees but less than 360 degrees

### Triangles

- A triangle is a polygon with three sides and three angles
- Triangle properties:
- Equilateral triangle: all sides are equal
- Isosceles triangle: two sides are equal
- Scalene triangle: all sides are unequal
- Right triangle: one right angle (90 degrees)
- Oblique triangle: no right angles

### Quadrilaterals

- A quadrilateral is a polygon with four sides and four angles
- Quadrilateral properties:
- Rectangle: all angles are right angles, opposite sides are equal
- Square: all sides are equal, all angles are right angles
- Rhombus: all sides are equal, opposite sides are parallel
- Trapezoid: two pairs of opposite sides, at least two sides are parallel

### Circles

- A circle is a set of points equidistant from a central point (center)
- Circle properties:
- Center: the fixed point equidistant from all points on the circle
- Radius: the distance from the center to any point on the circle
- Circumference: the distance around the circle
- Diameter: the longest distance across the circle, passing through the center

### Points

- A point is a location in space, represented by a set of coordinates (x, y, z) with no size, only position.

### Lines

- A line is a set of points extending infinitely in two directions, definable by two points or a point and a slope.
- Collinear points lie on the same line.
- Intersecting lines share a common point.
- Parallel lines never intersect and are always the same distance apart.
- Perpendicular lines intersect at a 90-degree angle.

### Angles

- An angle is formed by two rays sharing a common endpoint (vertex).
- Acute angles are less than 90 degrees.
- Right angles are exactly 90 degrees.
- Obtuse angles are greater than 90 degrees but less than 180 degrees.
- Straight angles are exactly 180 degrees.
- Reflex angles are greater than 180 degrees but less than 360 degrees.

### Triangles

- A triangle is a polygon with three sides and three angles.
- Equilateral triangles have all sides equal.
- Isosceles triangles have two sides equal.
- Scalene triangles have all sides unequal.
- Right triangles have one right angle (90 degrees).
- Oblique triangles have no right angles.

### Quadrilaterals

- A quadrilateral is a polygon with four sides and four angles.
- Rectangles have all angles as right angles, with opposite sides equal.
- Squares have all sides equal, with all angles as right angles.
- Rhombi have all sides equal, with opposite sides parallel.
- Trapezoids have two pairs of opposite sides, with at least two sides parallel.

### Circles

- A circle is a set of points equidistant from a central point (center).
- The center is the fixed point equidistant from all points on the circle.
- Radius is the distance from the center to any point on the circle.
- Circumference is the distance around the circle.
- Diameter is the longest distance across the circle, passing through the center.

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## Description

Understand the fundamental concepts of geometry, including points, lines, and their properties. Learn about collinear points, intersecting lines, parallel lines, and perpendicular lines.