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# Surface area using a net: triangular prism

Here are the steps to compute the surface area of a triangular prism: 1. Find the areas of each of the three rectangular faces, using the formula for the area of a rectangle: length x width. 2. Next, find the area of the two triangular faces, using the formula for the area of a triangle: 1/2 base x height. 3. Add the areas of all five faces together, and you're done!

## Want to join the conversation?

• At How did he get 1/2
• Like i said to selion if your talking about how he got the 1/2, thats apart of the formula. Which is, Half of the base times the height, OR, Half the height times the base
• How many nets for a prism is there?
• There are in fact, 9 nets for a triangular prism you saw in Sal's video. Never can a prism or shape have 1 or less net.
• i need help on nets and surface area
• If you don't understand this, try going back to Unit 8 - Plane figures (if you haven't already done it, complete it before going back to this). You can also try the course called "Getting ready for 6th grade."

Here is how to find areas of different parts of nets:

The formula for a triangle is 1/2 times Base times Height.

The formula for a square is Base times Height.

The formula for a parallelogram is to break it into two smaller triangles, switch it around to make a square, and find Base times Height of the square.

The formula for any other shape is break into other shapes (triangles, squares, etc.), find the area for all the broken-up shapes, and add it all up.

Once you have found the area for all the parts of the net, add the parts together to find the area of a net.
Hope this helps!
• sooo i ahve a question to anyone who whould like too answer me....... HOW DO YOU DO THIS? im so lost its sad can yall please help!
• A= HB/2 (Half of the base times height, Thats the formula for a triangle, i dont have time to give you the other formulas but i hoped this helped.
• is there a better way to explain this like a talk through b/c is still dont understand.
• i have lost brain cells
• this is so confusing
• ikr its too confusing
(1 vote)
• how come the video will not play