Transcript Area and Perimeter By Christine Berg Edited by V T Hamilton Perimeter The sum of the lengths of all sides of the figure.

Area and
Perimeter
By Christine Berg
Edited by V T Hamilton
Perimeter
The sum of the
lengths of all sides of
the figure
Area
The number of
square units inside a
figure
Calculating
Area
Area
Abbreviations:
A = Area
b = base
h = height
Rectangle
To find the area
multiply the length of
the base
times the height
Rectangle
A = bh
Parallelogram
Draw a rectangle on
graph paper. Cut off a
triangle on one side and
add it to the other.
1
2
3
Parallelogram
The rectangle becomes
a parallelogram so the
formula is the same as
for a rectangle
Triangle
The area of a triangle
is one half of the
length of the base
times the height
Triangle
4in
4in
Area of the square is
4 times 4 or 16 sq. in.
Area of the triangle is
one-half 16, or 8 sq.in.
A = 1/2 bh
A = 1/2 (4)(4)
A = 8 sq. in.