Respuesta :

Answer:

73.131

Step-by-step explanation:

T=  

s(s−a)(s−b)(s−c)

​  

 

T=  

20.9(20.9−15)(20.9−17)(20.9−9.81)

​  

 

T=  

5348.14

​  

=73.13

Answer:

128

Step-by-step explanation:

15 × 17 ÷ 2 = 127.5

Round to 128

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