Answer: C. 75
Concept:
Here, we need to know the idea of quadrilaterals in a circle.
The opposite angles of quadrilaterals in a circle (<u>cyclic quadrilaterals</u>) are supplementary, meaning they<u> add up to 180°</u>
If you are still confused, please refer to the attachment below for a graphical explanation.
Solve:
<u>Given information</u>
The opposite angle of b = 105°
<u>Given expression</u>
b + opposite angle of b = 180°
<u>Substitute values into the expression</u>
b + 105 = 180
<u>Subtract 105 on both sides</u>
b + 105 - 105 = 180 - 105
b = 75°
Hope this helps!! :)
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