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jada741
08.07.2019 •
Mathematics
Use the diagram, which is not drawn to scale, to decide which proportions are true. a. i and iv only c. i and ii only b. ii only d. i only select the best answer from the choices provided a b c d
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Ответ:
I think of these in terms of "short side", "long side" and "hypotenuse." The proportions will be true that equate the ratios of corresponding sides.
I is (long side of CDB)/(short side of CDB) = (long side of BDA)/(short side of BDA)
These are corresponding sides, so the proportion is true.
II is (hypotenuse of CBA)/(long side of CBA) = (long side of CBA)/(hypotenuse of CBA)
This proportion equates a value to its inverse, so is false (since the triangle has non-zero area)
III is (long side of CBA)/(short side of CBA) = (hypotenuse of CBD)/(long side of CBD)
The sides involved here are not corresponding, so this is false.
IV is (long side of CDB)/(hypotenuse of CDB)/(long side of BDA)/(hypotenuse of BDA)
These are corresponding sides, so the proportion is true.
The appropriate choice is ...
... a. I and IV only
Ответ:
x^2+10x+21
Step-by-step explanation: