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Klio2033 [76]
3 years ago
8

PLEASE ANSWER QUICKLY ASAP READ THE QUESTION CAREFULLY PLEASE ​

Mathematics
2 answers:
Anna11 [10]3 years ago
6 0

Answer:

140°

Step-by-step explanation:

total angle of a hexagon is 720. We know already 510°. That leaves 210°. The ratio between the two angles is 2:1, therefore angle CDE is 140° and angle DEF is 70 °

AURORKA [14]3 years ago
4 0

Answer:

140°

Step-by-step explanation:

We know that all of these angles here are part of a hexagon, meaning that their angle measures will all add up to 720°.

We can use what we already know and find what CDE and DEF will add up to.

145+90+160+115=510\\720-510=210

Now, assuming x is the measure of DEF, we can create an equation for this.

x + 2x = 210\\3x = 210\\x = 70

This is the measure of DEF, but it asks for CDE, which is twice the size of DEF. So

70\cdot2=140

We can double check this is right by adding up all the measures.

145+90+160+115+140+70=720

Hope this helped!

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