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h=10cm
b²=(1/2 a)²+h²
b²=5²+10²=25+100=125 =25*5
b=√(25*5)
b=5√5 cm
O=a+2b
O=10+2*5√5
O=10(1+√5)cm obwód
x²= 25 + 100
x²= 125
x= √125= √25· 5= 5√5
Ob= 10cm + 2· 5√5cm= (10 + 10√5)cm