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katen-ka-za [31]
3 years ago
13

Please answer quickly!!!

Mathematics
1 answer:
yKpoI14uk [10]3 years ago
3 0

Answer:

c=20

Step-by-step explanation:

The diagonals of a rectangle always bisect each other. Therefore, we can set QT=ST:

c=4c-60,\\-3c=-60,\\c=\fbox{20}

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