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Question

If the angles in a triangle are in the ratio 1 : 3 : 5, then the smallest and largest angles are


A
20,100
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B
60,100
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C
60,80
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D
20,60
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Solution

The correct option is A 20,100

Let the angles be x,3x and 5x

x+3x+5x=180

                9x=180

                  x=1809=20

Smallest angle, x=20
Largest angle, 5x=5×20=100


Mathematics

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