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z pitagorasa obliczam h
h²=5²-4²
h²=25-16
h²=9
h=3
obwód=5+3+9+5=22cm
pole=½(5+9)×3=21cm²
9cm/3=3cm - drugie ramię
Obw. = 5cm+9cm+5cm+3cm= 22cm
__5cm
3cm | \ 5cm
|____ \
9cm
P= a+b/2 * H
P= 5+9/2 * 3
P= 14/2 * 3
P=7*3
P=21cm(kwadratowe)
Ob=a+b+c+d
Ob= 5cm+3cm+9cm+5cm
Ob=22