Asolid has faces that consist of 5 congruent squares and 4 congruent equilateral triangles. the solid has 9 vertices. how many edges does the solid have? (no image)
a.
16 edges
b.
18 edges
c.
20 edges
d.
22 edges

The answer is A. 16 edges

For most of the solid shapes, we can use Euler's polyhedron formula:
f + v - e = 2
f - the number of faces
v - the number of vertices
e - the number of edges

We know:
f = 5 + 4 = 9
v = 9
e = ?

So:
f + v - e = 2
9 + 9 - e = 2
18 - e = 2
18 = e + 2
e = 18 - 2
e = 16

No a triangle cannot be formed because when you add the two smallest number together (which would be 11) the have to be bigger than the number it is "against" ( which would be 12)

For me i think it'll land on blue