Mathematics, 03.01.2020 01:31 biancabahena04
If m arc cd = 143°, and m arc ab = 39°, what is m∠ dec ?
Answers: 2
![m\angle DEC=\frac{1}{2}[arc\ AB+arc\ DC]](/tpl/images/0440/6254/f530b.png)
![m\angle DEC=\frac{1}{2}[39^o+143^o]](/tpl/images/0440/6254/c548c.png)
![m\angle DEC=\frac{1}{2}[182^o]](/tpl/images/0440/6254/8c829.png)
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If m arc cd = 143°, and m arc ab = 39°, what is m∠ dec ?...
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