Question

find the value of x in the given figure

Answer 1

ABC is a straight line and a straight line always have an angle 180°

So,

$= > \bf \: (3x + 10) + x + 90 = 180 \\ \\ or . \: \: \: 4x + 100 = 180 \\ \\ or. \: \: \: 4x = 180 - 100 = 80 \\ \\ or. \: \: \bf \: x = \frac{80}{4} = 20°$
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