Two isosceles triangles ACB and ADB have a common base AB, and their planes form an angle of 30 degree. Find the distance DE between the vertex D and the plane containing triangle ACB if the height DF of triangle ADB is 16 cm.

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Question

Two isosceles triangles ACB and ADB have a common base AB, and their planes form an angle of 30 degree. Find the distance DE between the vertex D and the plane containing triangle ACB if the height DF of triangle ADB is 16 cm.

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anonymous · Answer

|dw:1353420552934:dw| what is F and E?

anonymous · Answer

i don't know where to put them..

anonymous · Answer

I have no idea if E and F are points or so...lol

anonymous · Answer

DF is the height, this i know

anonymous · Answer

|dw:1353478033352:dw|

what i did is like this.. but i don't know if its right