Grade 4 - Geometry (Lessons 4-5)
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20 terms
Terms | Definitions |
|---|---|
 Circle | closed plane figure made up of all the points that are the same distance from the center |
| Radius | any line segment that connects the center to a point on the circle |
| Diameter | any line segment through the center that connects 2 points on a circle |
| Chord | any line segment that connects 2 points on a circle |
| What degrees should all the angles in a circle measure? | 360° |
| Center of a Circle | point in the middle of the circle |
| Isosceles Triangle (named for its sides) | a triangle with at least 2 sides the same length |
| Scalene Triangle (named for its sides) | a triangle with none of its sides the same length |
| Equilateral Triangle (named for its sides) | a triangle with all sides that are the same length |
| Right Triangle (named for its angles) | a triangle with 1 angle equal to a right angle (90°) |
| Acute Triangle (named for its angles) | a triangle where all 3 angles are acute (less than 90°) |
| Obtuse Triangle (named for its angles) | a triangle where 1 angle is obtuse (greater than 90°) |
| What is the sum of all the angles in a triangle? | 180° |
| How are quadrilaterals named? | Named by their angles or pairs of sides |
| Parallelogram | quadrilateral with both pairs of opposite sides parallel |
| Trapezoid | quadrilateral with 1 pair of parallel sides (the other sides will intersect) |
| Rectangle | parallelogram (quadril) with 4 right angles |
| Square | parallelogram (quadril) with 4 right angles and all 4 sides are the same length |
| Rhombus | parallelogram (quadril) with 4 sides the same length (slanted square) |
| What is the sum of all the angles in a quadrilateral? | 360° is the sum of the angles in a quadrilateral |
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