The angles in a triangle are in the ratio 1 : 2 : 9 What is the size of the largest angle?
a)135 degrees
b)95 degrees
c)140 degrees
d)160 degrees
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1
Answer:
135
Let the angles be x,2x,9x
Sum of all angles of triangle is 180
so,
x+2x+9x=180
x=15
largest angle is 9x= 9×15=135
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