spoiler
5/2*pi
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B+B+B=30 B+H+H=20 H+A+A=9
B=20-2H
20-2H+20-2H+20-2H=30
60-6H=30
60-30=6H
30/6=H
H=5
B=10
5+2A=9
2A=9-5
2A=4
A=4/2
A=2
intermediate Result: H=5 B=10 A=2
(H+H-B) -> inf 0 -> inf integral of (((B sin(D))/ (A D))dD
Simplifying
0 -> inf integral of B/A (sin(D)/D)dD
It is known that 0->inf of (sin(x)/x)dx is equal to π/2 Then (10/2)(π/2)
Final Result: 5π/2
Sorry for the formatting, I don't know how to fix it
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