Image caption, STEP 3: The given angle here in green is 80°. The angles on a straight line always add up to 180°, so the purple angle next to it must be 100°. Image caption, STEP 4: Work out ...
Second, angles on a straight line add up to 180 degrees ... The sum of these angles is 180Ëš. There is one missing angle in this complete turn. To find the size of the missing angle, first ...
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