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2D Shapes and their properties
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Gravity
Key Concepts:
Terms in this set (23)
Circle
square
A quadrilateral with 4 sides that are equal and has all 90 degree angles
octagon
a polygon with 8 sides
Pentagon
5 sided polygon
Polygon
a flat, two-dimensional (2D) shape with straight sides that is fully closed. The sides must be straight. A shape with curved sides is not a polygon.
Rhombus
A parallelogram with four equal sides
Triangle
A polygon with three sides and one 90 degree interior angle.
Equilateral Triangle
A triangle with three equal length sides and angles each 60 degrees.
Scalene triangle
A triangle with no equal sides
Rectangle
A quadrilateral with four right angles and opposite sides the same length
Square
A quadrilateral with 4 sides that are equal and has all 90 degree angles (a special type of rectangle)
Hexagon
6 sided polygon
Heptagon
7 sided polygon
Decagon
10 sided polygon
Nonagon
9 sided polygon
Parallelogram
A quadrilateral with two pairs of parallel sides and diagonally opposite angles equal
Trapezium shape
Four-sided quadrilateral with one pair of parallel sides
Kite
A quadrilateral that has two pairs of sides of equal length and one pair of opposite angles.
Isosceles Triangle
A triangle that has 2 equal sides and angles
Two of the angles in a triangle are 70° and 40° degrees. Explain why this cannot be an equilateral triangle.
In an equilateral triangle all the angles must be 60°
Circumference
The distance around a circle
Diameter
The distance across a circle through its center
Radius
The distance from the center of a circle to any point on the outside of a circle.
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