GED Math : 2-Dimensional Geometry
Study concepts, example questions & explanations for GED Math
All GED Math Resources
Example Questions
Example Question #371 : Geometry And Graphs
Find the area of a rectangle with a length of 15in and a width that is a third of the length.
To find the area of a rectangle, we will use the following formula:
where l is the length and w is the width of the rectangle.
Now, we know the length of the rectangle is 15in. We know the width is a third of the length. Therefore, the width is 5in. So, we can substitute. We get
Example Question #372 : Geometry And Graphs
Find the area of a square with a length of 7in.
To find the area of a square, we will use the following formula:
where x is any side of the square. Because a square has 4 equal sides, we can use any side of the square in the formula.
Now, we know the length of the square is 7in. So, we can substitute. We get
Example Question #373 : Geometry And Graphs
Find the area of a rectangle with a length of 
Write the formula for the area of a rectangle.
Substitute the dimensions.
The answer is:
Example Question #374 : Geometry And Graphs
Find the area of a square with a length of 
Write the formula for the area of a square.
Substitute the side length.
The answer is:
Example Question #81 : Squares, Rectangles, And Parallelograms
Find the area of a square with a side of 
Write the formula for the area of a square.
Substitute the side.
The answer is:
Example Question #42 : Area Of A Quadrilateral
Find the area of a square if the side length is 
The area of a square is:
Substitute the side into the area formula of the square.
Squaring a radical will leave just the term inside the radical.
The area is:
Example Question #42 : Area Of A Quadrilateral
A rectangle has a diagonal of 
The rectangle given in the question can be drawn out as thus:
Notice that the diagonal is also the hypotenuse of a right triangle that has the length and width of the rectangle as its legs. Thus, use the Pythagorean Theorem to find the length of the width of the rectangle.
Next, recall how to find the area of a rectangle.
Plug in the length and width of the rectangle.
Example Question #82 : Squares, Rectangles, And Parallelograms
Suppose you receive a square sheet of wood which you are planning on making into a box. If the sheet is 
Suppose you receive a square sheet of wood which you are planning on making into a box. If the sheet is 
To find the perimeter of a rectangle, use the following formula:
So, let's plug in our length and width and solve:
Example Question #374 : Geometry And Graphs
A rectangular television has a diagonal of 
The figure above represents the television.
Use the Pythagorean Theorem to find the length of the rectangle.
Next, recall how to find the area of a rectangle.
For the given rectangle,
Make sure to round to two places after the decimal.
Example Question #375 : Geometry And Graphs
Teresa has a circular lot that has a diameter of 
In order to maximize the size of the swimming pool, the circular lot and the square pool must share the same center as shown by the figure below:
Now, notice that the diameter of the swimming pool is also the diagonal of the square.
We can then use the Pythagorean Theorem to find the length of a side of the square.
Solve for the side length.
Now, recall how to find the area of a square:
Plug in the found length of the side to find the area.
All GED Math Resources
