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Two of the angles around point O are equal and are each marked $x$ . The third angle is 150°. Find $x$ .

Class 7Angles Around a PointLines and Angles

A105°
B210°
C75°
D15°

Step-by-Step Solution

x + x + 150

° = 360°, so

2 x = 210

° and

x = 105

°. (15° comes from using 180° instead of 360°, and 210° forgets to halve.)

Answer: A) 105°

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