The document defines and provides key properties of common geometric shapes: circles have a center point and all points are equidistant; squares are rectangles where all sides are equal length; rectangles have four sides and right angles while parallelograms have opposite parallel sides; triangles have three sides and their area can be calculated with half the base times the height.

1. PATTERNS
CIRCLE, SQUARE,
RECTANGLE,
PARALLELOGRAM,
TRIANGLE

2. CIRCLE
A circle is the set of all points in a plane that are equidistant
from a given point in the plane, which is the center of the
circle.
Area = pi r^2
r

3. SQUARE
A square can also be defined as a parallelogram with equal
diagonals that bisect the angles. If a figure is both a
rectangle (right angles) and a rhombus (equal edge lengths),
then it is a square .
• Area= side x side
side
side side
side

4. RECTANGLE
A 4-sided flat shape with straight sides where all interior
angles are right angles (90°). Also opposite sides are
parallel and of equal length. Example: A square is a special
type of rectangle
• Area= Length x Breadth
breadth
length

5. PARALLELOGRAM
A 4-sided flat shape with straight sides where opposite
sides are parallel. .
Area = base(b) x height (h)
h
b

6. TRIANGLE
A triangle is a three sided figure with three angles in its
interior. The symbol for triangle is Δ. A triangle is named
by the three letters at its vertices (the plural of vertex), a
fancy name for corners.
Area = ½ x base (b) x height (h)
h