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IBHI=x
IBMI=a/2
x/a=a/b
x=a²/b
cosα=a/b, α=∡CBA
sin²α=1-(a²/b²)
sin²α=(b²-a²)/b²
sinα=[√(b²-a²)]/b
P=(1/2)IBMI*IBHI*sinα
P=(1/2)*(a/2)*(a²/b)*[√(b²-a²)]b