1. Geometry – Grade 5
2-D Shapes

2. Vocabulary You Need to Know!
Point
An exact, specific position
Line
Extends to infinity in both directions from a specific point
Line Segment
A line that begins at one specific point and ends at another specific point

3. Vocabulary You Need to Know!
Angle
The figure formed when two lines intersect at a point
Acute Angle
An angle whose measure is less than 90 degrees
Obtuse Angle
An angle whose measure is more than 90 degrees

4. Plane Figure Polygon Triangle Vocabulary You Need to Know!
A flat, 2-D figure – it has no depth.
The point where 2 sides intersect is call the vertex (vertices)
Polygon
A closed figure made of line segments
Triangle
A three sided polygon

5. Equilateral Isoscolese Scalene Right Triangles!
A triangle with three equal sides
Isoscolese
A triangle with two equal sides
Scalene
A triangle with three different side lengths
Right
A triangle with a right angle

6. A quadrilateral whose sides and angles are different
A polygon with 4 sides
Regular
A quadrilateral whose sides are the same length and the angles are the same
Irregular
A quadrilateral whose sides and angles are different

7. Quadrilaterals! Trapezoid Parallelogram Rhombus
A quadrilateral with exactly one pair of parallel sides
Parallelogram
A quadrilateral with two pair of parallel sides
Rhombus
A quadrilateral with 4 equal sides

8. A quadrilateral with 2 sets of parallel sides and 4 equal angles
Quadrilaterals!
Rectangle
A quadrilateral with 2 sets of parallel sides and 4 equal angles
Square
A quadrilateral with 2 sets of parallel sides of equal length and 4 equal angles