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True [87]
4 years ago
7

Figure CDEF is a parallelogram.

Mathematics
2 answers:
GrogVix [38]4 years ago
8 0

Answer:

5

Step-by-step explanation:

We know that FC = 10r - 20 and that DE = 6r. They can make an equation together since they are parallel and congruent. That gives us the equation

10r - 20 = 6r

-20 = -4r

5 = r

OR

10r - 20 = 6r

10 = 6r + 20

4r = 20

r = 5

Either way, you still get the answer of r = 5.

marishachu [46]4 years ago
7 0

Answer:

its 5

Step-by-step explanation:

opposite sides need to be equal

edge 2020

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4 years ago
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5 0
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How to solve the problem
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