How to Calculate Area and Perimeter
Different shapes require different methods to figure things out about them. Here we are going to look at how to calculate the area and perimeter of a triangle as well as rectangle for these will be able to help you to figure out solutions for these with just about any other shape once you have mastered the ability to do it for the two of these.
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Instructions
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The perimeter of any figure is an easy thing to determine. In order to be able to get the perimeter of either a triangle or a rectangle, all you need to do is know the length of all of the sides of the figure and then add all of these numbers together. The perimeter is the sum of all of the sides of a figure to get one length.
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Determining the area of a rectangle is a calculation in which you will need to use multiplication. To come up with the total area of a rectangle you will need to know the length of the rectangle as well as the width of the rectangle to get the right answer. You will then multiply the length times the width, which will provide you with the total area in square units and denoted as units squared such as miles or inches.
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Determining the area of a triangle is a more complex calculation for you to solve. In this calculation, you will need to know what the height of the triangle is as well as what the length of the base is. In a right triangle, the height and base are the lengths of the two legs that make up the right angle, whereas with any other triangle the height is a straight line that you draw from one angle to the opposite leg forming a right angle. The length of this line is your height, and the leg it intersects will serve as the base. Once you have the height and the base, you will multiply these two numbers together and then multiply them by one-half.
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Use these two calculations for area to find the area of any figure that has straight sides. You will simply need to break the figure up into rectangles and triangles, determine the area of each and then add them together.
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Resources
- Photo Credit compasses image by Jan Will from Fotolia.com
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Comments
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how to you find area with a none normal shape.
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its good
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I'm trying to help my son with this and its HARD as crap! I understand the perimeter thing but the erea is getting us stumped ;o(.
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ok but how do you find the height of a triangle other than a right triangle.
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ok but how do you find the height?
