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5²+h²=10²
25+h²=100
√h²=√75
h= √25*3
h = 5√3cm
P = a*h/2
P= 10 * 5√3 /2
P= 25√3cm²
lub
P = a²√3/4
P = 10²√3/4
P = 100√3/4
P=25√3cm²