What is the surface area of the square pyramid? use the net of the pyramid to find the surface area.
a.
219.8 mm2
b.
341.6 mm2
c.
170.8 mm2
d.
390.6 mm2

Using the net, we see that the square pyramid breaks down to 4 equivalent triangles and a square. We can use this formula to solve for the surface area:

Sa=A(square)+4*A(triangle)

The formula for the area of a square is

A=l*w
A=7*7
A=49mm²

The formula for the area of a triangle is:

A=1/2b*h
A=1/2*7*12.2
A=42.7mm²

Now that we have the individual areas of the shapes, we can solve for the surface area.

Sa=A(square)+4*A(triangle)
Sa=49mm²+4*42.7mm²
Sa=49mm²+170.8mm²
Sa=219.8mm²

Answer=219.8mm²
ANSWER=A

The right answer is option d.

If i think this is what your asking, he should look at the grams or pounds/ounces and compare the to their cost then max can identify which one is proportional and which is not ( i think xd)