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Find the value of x. (a)3/140

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in Mathematics – Class 8 by (91.0k points)
Find the value of x.

(a) 3/140

(b) 150/7

(c) 140/3

(d) 7/150

The question was asked in quiz.

Origin of the question is Sum of Measures of the Exterior Angles of a Polygon in section Quadrilaterals of Mathematics – Class 8

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Best answer
The correct option is (c) 140/3

Easiest explanation: Here we are given a triangle with all it’s internal angles marked in terms of x.

Now we will use the property of triangle.

Therefore (x+20)°+(x+30)°+(x-10)°=180°

Therefore x+20+x+30+x-10=180

Therefore 3x=140

Therefore x=140/3.

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