4 years ago

What is the value of r?

Mathematics

1 answer:

Harrizon [31]4 years ago

4 0

The answer is (B) -5.

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3 years ago

If a polyhedron has 5 faces and 7 vertices, then it must have how many edges? Please show step-by-step work

Juli2301 [7.4K]

Answer:

10 edges

Step-by-step explanation:

we know that

The Euler's formula state that: In a polyhedron, the number of vertices, minus the number of edges, plus the number of faces, is equal to two

$V - E + F = 2$

in this problem we have

$V=7\\E=?\\F=5$

substitute the given values

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Combine like terms in the left side

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3 years ago