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27.10.2020 •
Mathematics
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Ответ:
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.