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kotykmax [81]
3 years ago
15

A solid 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
Mathematics
1 answer:
gavmur [86]3 years ago
5 0
The answer is A. 16 edges

Euler's polyhedron formula:
f + v - e = 2
f - the number of faces
v - the number of vertices
<span>e - the number of edges
</span>
f = 5 congruent <span>squares + 4 congruent equilateral triangles = 9
v = 9
e = ?

f + v - e = 2
e = f + v - 2
e = 9 + 9 - 2
e = 16</span>
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