Maths / Triangles / Angle Sum Property of a Triangle

QUESTION
 

The angles of a triangle are large (x-40^0),(2x-20)^0 and frac{1}{2}x-10^0 .Find the value of x.

OPTIONS
A. 

120

B. 

100

C. 

90

D. 

70

Right Option : D

EXPLANATION
Explain TypeExplanation Content
Text

The angles of a triangle are 1280

large (x-40^0)+(2x-20)^0+frac{1}{2}x-10^0= 180^0

large 3x-60^0+frac{x}{2}-5^0= 180^0

large frac{7x}{2}-65^0= 180^0

large frac{7x}{2}= 180^0+65^0=245^0

large 7x=490^0

large x=70^0

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