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52/4=13cm (bok)
Przekątne:
e=13-3=10cm
f=13+11+24cm
P=1/2*10*24
P=1200 cm
a=13
13-3=10 - 1 przek.
13+11=24 - 2 przek.
P=10*24/2=120
a=?
b=a-3
c=a+11
11+11-3-3=22-6=16[cm]
52cm-16cm=36cm
36cm:4=9cm
a=9cm
b=9cm-3cm=6cm
c=9cm+11cm=20cm
P=(b*c):2
P=(6cm*20cm):2
P=120cm:2=60cm²
P=60cm²