If the lengths of the sides of a triangle are in A.P. and the greatest angle is double the small....

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If the lengths of the sides of a triangle are in A.P.
P
and the greatest angle is double the smallest, then a ratio of lengths of the sides of this triangle is:
(1) \( 5: 9: 13 \)
(2) \( 5: 6: 7 \)
(3) \( 4: 5: 6 \)
(4) \( 3: 4: 5 \)


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