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a=10cm
b=5√3cm
h²=(5√3)²-5²
h²=75-25
h=√50
h=5√2cm
P=1/2 * 10 * 5√2
P=25√2cm²
a=10cm
b=5√3cm
O=10+5√3+5√3
O=10+10√3
O=10(1+√3)cm