The formula for the area of a parallelogram is:
A = bh, where b is the length of the base and h
is the length of the height.
The formula for the area of a parallelogram is:
A = bh, where b is the length of the base and h
is the length of the height.
The formula for the area of a rectangle is:
A = lw, where l is the length of the length and
w is the length of the width of the rectangle.
The formula for the area of a parallelogram is:
A = bh, where b is the length of the base and h
is the length of the height.
The formula for the area of a rectangle is:
A = lw, where l is the length of the length and
w is the length of the width of the rectangle.
The formula for the area of a square is:
A = s2, where s is the length of a side of the
square.
Since squares and rectangles are also
parallelograms, the formula for the area of a
parallegram also works for squares and
rectangles.
Since squares and rectangles are also
parallelograms, the formula for the area of a
parallegram also works for squares and
rectangles.
For a square, one of the sides can be thought
of as the base and another side can be thought
of as the height.
Since squares and rectangles are also
parallelograms, the formula for the area of a
parallegram also works for squares and
rectangles.
For a square, one of the sides can be thought
of as the base and another side can be thought
of as the height.
For a rectangle, the length can be thought of
as the base and the width can be thought of as
the height or vice versa.
b
b
b
h
h
b
b
h
b
The red segments are diagonals.
h
h
b
b
h
b
The red segments are diagonals.
h
h
b
h
b
b
The formula for
the area of a
triangle is:
A = 12 bh
b
b
b
b
h
b
b
b
b
h
h
b
b
b
b
h
h
b
b
h
b
b
h
h
b
b
h
b
h
b
h
h
b
b
h
b
h
The formula for the area of a
triangle is: A = 12 bh
b
Any of the three sides of a triangle may
be used as the base.
Any of the three sides of a triangle may
be used as the base.
h
b
Any of the three sides of a triangle may
be used as the base.
h
b
Any of the three sides of a triangle may
be used as the base.
h
h
b
b
Any of the three sides of a triangle may
be used as the base.
h
h
b
b
Any of the three sides of a triangle may
be used as the base.
h
h
b
b
h
b
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
b = 9.3 cm
0
118°
1
2
1
3
4
2
6
7
3
8
9
4
11
12
5
13
14
15
10
5
0
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
b = 9.3 cm
h = 6.0 cm
15
14
5
13
12
11
4
10
9
3
8
7
2
6
5
4
1
3
2
1 151° 0
0
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
b = 9.3 cm
h = 6.0 cm
15
b = 5.9 cm
5
14
13
12
4
11
10
3
9
8
7
6
2
5
1
4
3
2
0
1 162°
0
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
15
14
13
5
12
11
b = 9.3 cm
h = 6.0 cm
10
9
8
3
7
6
5
4
3
1
2
1
74°
0
0
2
4
b = 5.9 cm
h = 9.2 cm
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
15
14
13
5
12
b = 9.3 cm
h = 6.0 cm
11
b = 5.9 cm
h = 9.2 cm
4
10
9
8
3
7
6
b = 10.0 cm
2
5
4
3
1
2
1
97°
0
0
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
b = 9.3 cm
h = 6.0 cm
b = 5.9 cm
h = 9.2 cm
b = 10.0 cm
h = 5.5 cm
0
0
1
5°
3
2
1
4
5
2
6
8
7
3
9
11
10
4
13
12
5
14
15
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
b = 9.3 cm
h = 6.0 cm
A = 27.9 cm2
b = 10.0 cm
h = 5.5 cm
b = 5.9 cm
h = 9.2 cm
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
b = 9.3 cm
h = 6.0 cm
A = 27.9 cm2
b = 10.0 cm
h = 5.5 cm
b = 5.9 cm
h = 9.2 cm
A = 27.14 cm2
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
b = 9.3 cm
h = 6.0 cm
A = 27.9 cm2
b = 10.0 cm
h = 5.5 cm
A = 27.5 cm2
b = 5.9 cm
h = 9.2 cm
A = 27.14 cm2
10 cm
11 cm
8 cm
11 cm
10 cm
11 cm
11 cm
8 cm
Perimeter = 11 cm + 11 cm + 8 cm = 30 cm
10 cm
11 cm
11 cm
8 cm
Perimeter = 11 cm + 11 cm + 8 cm = 30 cm
Area = 0.5 • 8 cm • 10 cm = 40 cm2
m
7c
6 cm
14.8 cm
10 cm
m
7c
6 cm
14.8 cm
10 cm
Perimeter = 10 cm + 14.8 cm + 7 cm = 31.8 cm
m
7c
6 cm
14.8 cm
10 cm
Perimeter = 10 cm + 14.8 cm + 7 cm = 31.8 cm
Area = 0.5 • 10 cm • 6 cm = 30 cm2
13
5 cm
cm
12 cm
13
5 cm
cm
12 cm
Perimeter = 5 cm + 12 cm + 13 cm = 30 cm
13
5 cm
cm
12 cm
Perimeter = 5 cm + 12 cm + 13 cm = 30 cm
Area = 0.5 • 5 cm • 12 cm = 30 cm2
The formula for
the area of a
triangle is:
A = 12 bh
Any of the three sides of a triangle may
be used as the base. There is a different
height for each base.
Another word sometimes used for
height is altitude.