Question

find the measure of x in the following figure with formula ​

Answer 1

Answer:

x + 20 + x = 180 (Linear pair)

2x + 20 = 180

2x = 160

x = 160/2 = 80

Answer 2

Since it is straight line,

$•°• \: (x + 20) + x = 180 \\ 2x + 20 = 180 \\ 2x = 160 \\ x = 80 \\ x + 20 = 100$

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