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use herons formula
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Triangle A
7/2 + 4 3/5 + 4 2/3
7/2 + 23/5 + 14/3
LCM =30
(105+138+140)/30
= 383/30
= 12 23/30 cm
Triangle B
3 1/4 + 7 1/2 + 2 1/4
13/4 + 15/2 + 9/4
LCM=4
(13+30+9)/4
= 52/4
= 13 cm
Triangle B has greater perimeter
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