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Find the missing angle in a triangle using the fact that the angles add to 180 degrees.
", "licence": "Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International"}, "statement": "What is the size of the missing angle $C$? All angles are measured in degrees.
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", "advice": "Recall that the angles in a triangle add up to $180^{\\circ}$.
\nWe can add together two angles we know and subtract the result from $180$ to find the size of our missing angle,
\n\\[ \\begin{split} 180 - (\\var{a} + \\var{b}) &\\, = 180 - (\\var{a+b}) \\\\ &\\, = \\var{180-(a+b)}^{\\circ}. \\end{split} \\]
\nUse this link to find resources to help you revise properties of triangles.
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