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What does the following expression represent?

19

Expression 20: StartFraction, left parenthesis, "d" minus 0 , right parenthesis Over left parenthesis, 0 minus "b" , right parenthesis , EndFraction times StartFraction, left parenthesis, "a" minus 0 , right parenthesis Over left parenthesis, 0 minus "c" , right parenthesis , EndFraction

equals

negative 0.6 2 5

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Expression 21:

21

Can you explain the following?

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When CD and AB are perpendicular, BD and AC must also be perpendicular.

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Expression 24:

24

You may drag the vertices to change the triangle and test again how might the altitudes meet. Can you make an obtuse triangle?

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Expression 26:

26

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powered by

"A" ( 0 , "a" )

"B" ( "b" , 0 )

"C" ( "c" , 0 )

"D" ( 0 , "d" )

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