Cut The Knot!
Games & Puzzles
Did you know?...
Math as Language
Other Math sit's
Recommend this site
>>Find F on AB with BCF = 50°. This brings us into the classical framework so that we, for example, know that BDF = 30°.
This "we know that" statement is a leap too far for me. Can anyone post the steps for showing that BDF really is 30 deg.
You may be curious to have a look at the old CTK Exchange archive.Please do not post there.
Copyright © 1996-2018 Alexander Bogomolny