Question

I herons formula S =20, a=1,b=8,then c=​

Answer 1

Answer:

20=(1+8+c)/2

40=9+c

c=31

Answer 2

Answer:

c=31

Step-by-step explanation:

s=a+b+c/2

20=1+8+c/2

2×20=9+c

c=40-9

c=31

Hope this helps you.