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10²=y²+h² h²=100-y²
22-y-x=12 x=10-y
(3√10)²=(10-y)²+100-y²
90=100-20y+y²+100-y²
-110=-20y
y=5,5
h=√(100-y²)=√(100-30,25)≈8,35cm
P=(a+b)×h/2=(12+22)×4,175≈141,95cm²
a=12
b=22
c=10
d=3√10
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