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allochka39001 [22]
4 years ago
13

I really need help with this ​

Mathematics
1 answer:
TiliK225 [7]4 years ago
3 0

Answer:

11cm

Step-by-step explanation:

Perimeter of triangle= sum of all three sides

28cm= AB +BC +AC

28cm= AB + 9cm +8cm

<em>Bringing</em><em> </em><em>all</em><em> </em><em>constants</em><em> </em><em>to</em><em> </em><em>one</em><em> </em><em>side</em><em>,</em>

AB= 28 -9 -8

AB= 11cm <em>(</em><em>simplify</em><em>)</em>

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