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PSYCHO15rus [73]
3 years ago
13

I need help with number 7

Mathematics
1 answer:
statuscvo [17]3 years ago
8 0
It's an equilateral triangle. So from what I can see the measure of angle D will be 60 because 60+60+60=180 and they are all congruent so it should be 60.
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Which theorem or postulate proves that △ABC and △DEF are similar?
yan [13]

Answer:

△ABC and △DEF are similar by SAS Similarity Theorem.

Option (C) is correct .

Step-by-step explanation:

Definition of SAS Similarity property

Two triangles are said to be similar by SAS Similarity property If two sides are proportional and one corresponding angle congruent .

In △ABC and △DEF

\frac{ED}{AB}= \frac{7}{21}

\frac{ED}{AB}= \frac{1}{3}

and

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Thus

\frac{ED}{AB}=\frac{EF}{BC}= \frac{1}{3}

∠ABC = ∠DEF  (As given in the figure )

Thus △ABC and △DEF are similar by SAS Similarity property .

7 0
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Answer:

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Step-by-step explanation:

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Standard form:

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