Geometry: Points, Lines, and Shapes Flashcards
Grade 4 · Math · Flashcards
Key geometry vocabulary and shape properties for Grade 4.
Flashcards
- Point
- An exact location in space. No size, just position.
- Line
- Extends infinitely in both directions. No endpoints.
- Line segment
- Part of a line with two endpoints. Has a fixed length.
- Ray
- Has one endpoint; extends infinitely in one direction.
- Parallel lines
- Never meet. Always the same distance apart.
- Perpendicular lines
- Meet at a right (90°) angle.
- Quadrilateral
- Any 4-sided polygon.
- Parallelogram
- Quadrilateral with 2 pairs of parallel sides.
- Rectangle
- Parallelogram with 4 right angles.
- Square
- Rectangle with all 4 sides equal.
- Trapezoid
- Quadrilateral with exactly 1 pair of parallel sides.
- Equilateral triangle
- All 3 sides and all 3 angles are equal (60° each).
- Right triangle
- Has exactly one 90-degree angle.
- Obtuse triangle
- Has one angle greater than 90 degrees.
- Acute angle
- An angle less than 90 degrees.
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