a Tetrahedron has side of length 20m The height of each triangle is 17.3 the shape has 4 sides

Question

the shape has 4 sides the shape is a pyramid with 4 sides instead of 5 this is a 3D figure 

Answer 1

So this shape is made up of 4 triangles that all have the same area. So we need to find the area of one of those triangles and then multiply that number by 4 to get our surface area.

The area of a triangle equals 1/2(base)(height).

or

A=1/2bh

Your base (b) is 20m

Your height (h) is 17.3m

So we can plug them in for their letters.

A=1/2(20)(17.3)

Plug that into the calculator...

A=173

Now we need to multiply this answer by 4 to represent all four sides of your tetrahedron.

Total Surface Area=173(4)

Total Surface Area=692m