# Calculating Area

I am a Landscape student and I am attempting to calculate the surface area of a slope of various polygonal forms (landscape areas).

In the attachments you will find one is a simple calculation for a triangle prism. This is whee I need to start from.

After that the prisms become more complex.

I want to know that if I have the base area (2D) of an area, say for example looking at a map in plan view, and I also know the rise/drop (as in a change in contours), is it possible to use this information to generate, say a percentage increase to then apply to the slope area to generate an answer.

I think the images should explain better than I can.

Thanks

Attached Images

Attached Images
 SURFACE AREA 2.pdf (37.4 KB, 102 views)
 ROLCAM Posts: 1,437, Reputation: 250 Ultra Member #2 Jan 26, 2009, 04:41 PM
The image says it all.

The area you need is :- x

Look at x and call the top perimiter d and
The bottom perimiter e.

Now the area formula becomes:-

c times { 1/2 (d + e)

This should be accurate enough.

## Check out some similar questions!

Calculating area from perimeter [ 5 Answers ]

Hi, I'd like to buy a home; I know the area according to the official records but I'd like to double-check by measuring the actual area. I walked along the perimeter of the land and it equals 452 meters. The shape of the land does not resemble any frequantly used geometrical figures; very...

Local area network&wide area network [ 1 Answers ]

I. If we can extend the LAN then why we need a WAN? Ii. How can a bridge know whether to forward frames? Iii. Can the length of an Ethernet be increased to many segments of 500 meter each merely by adding a repeater to connect each additional segment? Iv. How can a computer attach to a network...

Calculating Probabilities using area model [ 1 Answers ]

Two identical containers contain marbles. Container 1 has 2 white marbles and one red marble. Contanier 2 has one white marble and one red marble. Suppose you select a container at random and then draw out a marble. What is the probability of drawing a white marble? For my answer I got 2 out of...