Geometry
The Shapes Around Us
Line
Line Segment
Ray
Parallel Lines
Intersecting Lines
Perpendicular Lines
Circle
Chord
Diameter
Radius
Polygons
• straight lines
• closed
Triangle
• 3 sides
Quadrilateral
• 4 sides
Pentagon
• 5 sides
Hexagon
• 6 sides
Octagon
• 8 sides
Rectangle
• 4 sides
• opposite sides
same length
• 4 right angles
Square
• 4 equal sides
• 4 right angles
Rhombus
• 4 equal sides
• 2 pairs of parallel
sides
Trapezoid
• 1 pair of parallel
sides
Cube
Cone
Pyramid
Sphere
Rectangular Prism
Cylinder
Triangular Prism
Right Angle
• Formed by perpendicular lines.
• Measures 90°
Obtuse Angle
• Has a measure greater than 180°
Acute Angle
• Has a measure less than 90°
Isosceles Triangle
• At least two sides or angles that are equal.
Equilateral Triangle
• Three sides and angles that are equal.
Scalene Triangle
• No sides or angles that are equal.
Obtuse Triangle
• Has one obtuse angle.
Acute Triangle
• Has three acute angles.
Right Triangle
• Has one right angle.