-110
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Multiply the number by 1.7
30 * 76 = 30 * (70 + 6) = 30*70 + 30 * 6 = 2100 + 180 = 228030 * 76 = 30 * (70 + 6) = 30*70 + 30 * 6 = 2100 + 180 = 228030 * 76 = 30 * (70 + 6) = 30*70 + 30 * 6 = 2100 + 180 = 228030 * 76 = 30 * (70 + 6) = 30*70 + 30 * 6 = 2100 + 180 = 2280
Subtract 2 from the number of sides and multiply that by 180 degrees. (n-2)×180°
-43140
The inner angles of a triangle add up to 180 degrees. 180 - (70 + 30) = 80 degrees.