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x²=100-40
x²=60
x=√60
P=ab/2
P= 2√10 * √60/2
100= x² + 40
60= x²
x= √60
x= √4x15
x=2√15
P= ½ah
P=½ x 10 x 2√15
P=10√15
a=2√10
c-10
〖2√10〗^2+b^2=10^2
40+b^2=100
b^2=100-40
b=√60
P=1/2*a*b
P=1/2*2√10*√60
p=√600