doodleymooc doodleymooc

16-05-2018
Mathematics

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what is X in (3x-12)° on question number 7?

what is X in 3x12 on question number 7 class=

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sqdancefan sqdancefan

23-05-2018

The exterior angle is equal to the sum of the opposite interior angles.
(4x+9) = (2x) + (3x-12)
4x + 9 = 5x - 12 . . . . . . . . collect terms
21 = x . . . . . . . . . . . . . . . .add 12-4x

Then the exterior angle is
(4·21+9)° = 93°

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