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IACI=13
IBCI=20
ICDI²+IADI²=IACI²
12²+IADI²=13²
IADI²=169-144=25
IADI=5
ICDI²+IBDI²=IBCI²
12²+IBDI²=20²
IBDI²=400-144=256
IBDI=16
IABI=5+16=21
IABI=a+x+y
ICDI/IBDI= a/x
12/16=a/x
16a=12x /:12
x=16a/12
ICDI/IADI=a/y
12/5=a/y
5a=12y /:12
y=5a/12
IABI=21
IABI=a+x+y
IABI=a+ 16a/12 + 5a/12=a+ 21a/12=a+ 7a/4=4a/4 +7a/4=11a/4
11a/4=21 /*4
11a=84 /:11
a=84/11
a=7 ⁷/₁₁
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