Three angles meet at point O. Two of the angles are 115° and 143°. Find the third angle x.
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Worked Solution
Step 1: Recall — angles at a point sum to 360°.
Step 2: Write the equation: 115° + 143° + x = 360°.
Step 3: Add the known angles: 115° + 143° = 258°.
Step 4: Solve: x = 360° − 258° = 102°.
Answer: 102°
Correct answer: 102°
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