Question

In the diagram of circle o, what is the measure of ZABC?

O 30°
O 40°
O 50°
O 60

Answer 1

Answer:30

Explanation:

Answer 2

30°

Explanation:

Line AB and BC are tangents to the given circle.

`\angle \: ABC = (1)/(2) ( 210 - 150)`

`\angle \: ABC = (1)/(2) (60) = 30 \degree`

Alternatively, <ABC and <AOC are supplementary because AB and BC are tangents.

`\angle \: ABC + 150 \degree = 180 \degree`

`\angle \: ABC = 180 \degree - 150 \degree = 30 \degree`

The correct choice is A.