Question

It’s asking me what is the mistake and to fix it but I’m not sure what it is

Answer 1

arcEF = 66 degrees

Explanations:

The sum of angle at a point is 360 degrees. Taking the sum of all the measured arcs and equating to 360 will give;

`arcDE+arcEF+arcFB+arcBC+arcCD=360^0`

Substitute the given angles

`\begin{gathered} 82+arcEF+40+67+105=360 \\ arcEF+294=360 \end{gathered}`

Subtract 294 from both sides

`\begin{gathered} arcEF+294-294=360-294 \\ arcEF=360-294 \\ arcEF=66^0 \end{gathered}`

Hence the measure of the arcEF is 66degrees