Question
The measures of the angles of a triangle are 
.
Find the measure of each angle and classify the triangle by its angles.
Hint:
Find the value of x by using the sum of angles in a triangle is 180° . Now, find values of all angles .
The correct answer is: x = 200 , angles of the triangle as 40° , 20° and 120°.
ANS :- x = 200 , angles of the triangle as 40°, 20° and 120°.
Explanation :-
Step 1:- Find the value of x
The angles of triangle are 
= 180°
∴ X = 200
Step 2:- Find the value of angles
The angles of triangle are = 2 × 20 = 40°
= 20 = 20°
= 6 × 20 = 120°
We get angles of the triangle as 40°, 20° and 120° .
As 120° (> 90°) is an obtuse angle .
Then the given triangle will be an obtuse angled triangle
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