How to Calculate a Normal Triangle

Calculating a normal triangle can be determined by using a grid, such as a piece of graph paper. To do this, you need to first start with the shape of a square. This is called the box method and is used to calculate the total area of a triangle. You can use the box method to calculate a normal triangle or one that is of any size or shape.

Things You'll Need

• Graph paper

Instructions

1. Draw a 2-inch square in the middle of the graph paper.

2. Draw a vertical line to the right of the square and a horizontal line along the bottom of the square.

3. Label the vertical line "Y" and the horizontal line "X." Mark each line in increments of 5, up to 40 on line Y and 65 on line X.

4. Make a point at the following coordinates: (5, 10), (35, 10), (35, 45) and (5, 45). Connect the dots to form a square.

5. Label the point at (35, 10) as "B" and the point at (5, 45) as "C."

6. Make another point at coordinates (25, 35) and label this "A." Connect point B to point C by drawing a straight line.

7. Connect point B to point A by drawing a straight line. Connect point A with point C and draw another straight line. You now have the shape of a normal triangle.

Tips & Warnings

• The numbers on lines X and Y can be converted to inches, feet or any other measurement.

References

• Analyze Math: Triangle Problems
• Math Open Reference: Area of a Triangle - Box Method