Required information
Area of Rectangles and Triangles
As we progress in economics courses, there are some concepts that
are best handled geometrically as opposed to (or in addition to)
algebraically. We might, for example, need to calculate the area of
a triangle, a rectangle, or a trapezoid. Therefore, this document
will cover the basics of each, and give examples for
practice.
The area of a rectangle or square
A rectangle is a four-sided figure that has two sets of parallel
sides, so that we have two sides of one length and two sides of
another length; a square is just a special case of a rectangle in
which all four sides are the same length. Therefore, the procedure
for calculating area is the same no matter whether we are dealing
with a rectangle or a square.
The area of a rectangle is calculated as follows:
Area= base × height= b × hArea= base × height= b × h
In this formula, the base is the width of the rectangle and the
height is simply how tall the rectangle is. For example, if we have
a rectangle that is 20 centimeters wide and 10 centimeters tall,
its area can be calculated as follows:
Area= 20cm ×10cm= 200cm2Area= 20cm ×10cm= 200cm2
Note the superscript '2' in our answer; this is because we have
multiplied centimeters by centimeters. In economics, we are more
likely to be dealing with quantities bought or sold and prices, so
don’t worry about it too much for our discussion.
The area of a triangle
A triangle is really just a rectangle cut in half, so our formula
is just ½ times the formula for the area of a rectangle:
Area= 12 × b × hArea= 12 × b × h
For example, the area of a triangle that is 18 units tall and 40
units wide would be calculated as follows:
Area= 12 × 40 × 18= 40 × 182= 360units2Area= 12 × 40 × 18= 40 × 182= 360units2
Use the data in the table below to answer the following
questions.
X-variable |
Y-variable |
Point |
0 |
8 |
A |
0 |
5 |
B |
30 |
5 |
C |
0 |
4 |
D |
40 |
4 |
E |
0 |
3 |
F |
30 |
3 |
G |
0 |
0 |
H |
Plot the points CGE on the graph.
Instructions: Click the 3-point shader tool
called "CGE" and then click on the graph. This will place
a triangle on the graph. Click and drag each of the end points of
the shaded area until the triangle highlights the desired
region.
Calculate the following area:
The Area CGE = units2
Required information Area of Rectangles and Triangles As we progress in economics courses, there are some...
Required information Area of Rectangles and Triangles As we progress in economics courses, there are some concepts that are best handled geometrically as opposed to (or in addition to) algebraically. We might, for example, need to calculate the area of a triangle, a rectangle, or a trapezoid. Therefore, this document will cover the basics of each, and give examples for practice. The area of a rectangle or square A rectangle is a four-sided figure that has two sets of parallel...
Required information Area of Rectangles and Triangles As we progress in economics courses, there are some concepts that are best handled geometrically as opposed to (or in addition to) algebraically. We might, for example, need to calculate the area of a triangle, a rectangle, or a trapezoid. Therefore, this document will cover the basics of each, and give examples for practice. The area of a rectangle or square A rectangle is a four-sided figure that has two sets of parallel...
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