3 years ago

Pls answer this! I need to pass!

Mathematics

1 answer:

KengaRu [80]3 years ago

6 0

Answer:

Step-by-step explanation:

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Answer:

solution,

Let <DEF= x°

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$90 + 145 + 115 + 2x + x + 160 = 720 \\ 510 + 3x = 720 \\3x + 510 = 720 \\ 3x + 510 - 510 = 720 - 510 \\ 3x = 210 \\ \frac{3x}{x} = \frac{210}{3} \\ x = 70 \: degree$

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