A triangle is a three-edged polygon with three vertices. The correct option is B, 30°.
What is a triangle?
A triangle is a three-edged polygon with three vertices. It is a fundamental form in geometry. The sum of all the angles of a triangle is always equal to 180°.
In a triangle, the sum of any two angles is equal to the measure of the exterior angle formed at the end of the third angle. Therefore, we can write,
100° = 70° + x
x = 100° - 70°
x = 30°
Hence, The value of x is 30°.
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