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PF1 = m. PF2 = n.
m + n = 2a = 10
m^2 + n^2 -2mncos60 = (2c)^2 = 64
--- mn = 12
S = mnsin60/2 = ....
m + n = 2a = 10
m^2 + n^2 -2mncos60 = (2c)^2 = 64
--- mn = 12
S = mnsin60/2 = ....
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