the sum of 3 angles (5a+4) , (a-2) , (3a+7) forms a straight angle find the types of angles
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the sum of 3 angles (5a+4) , (a-2) , (3a+7) forms a straight angle find the types of angles
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(5a+4)+(a-2) +(3a+7) =180°
5a + 4+a-2+3a+7=180°
9a +9 =180°
9a=180-9
9a=171
a=171÷9
a=19
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