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13-04-2017
Mathematics

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I'm not sure how to set this one up, what I did was 9+12+21+0 +X =360 and I got 318 but that's not an answer

Im not sure how to set this one up what I did was 912210 X 360 and I got 318 but thats not an answer class=

Respuesta :

13-04-2017

Circle Circumference = 180°

Answer: D.) x = 28.0

180° - (9° + 12° + 21°)
= 180° - 42°
= 138°
138° ÷ 2 = 69°

28° + 28° = 56°

Then you have a small triangle left of the 180°. So this leaves you with that triangle = 13°

Answer: D.) x = 28.0

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