In isosceles ?ACB, AC ? BC, in isosceles ?AFB, AF?BF. Prove that AEBC ? ?DAC.
(Outline) ?CAB? ?CBA by Thms 4.5, ?FAB ? ?FBA by Thm 4.5. ?FBA + ?FBD = ?DBA, ?FAB + ?FAE = ?EAB therefore ?FBD ? ?EAE. AC ? BC given. ?BCA ? ?ACB identity. ?EBC ? ?DAC by ASA.
Mathematics
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A. 
B. 
C. 
D. 
Mathematics
Write the number in words.235,060
A. Two hundred thirty-five thousand, sixty B. Twenty-three thousand, five hundred sixty C. Two million, thirty-five thousand, sixty D. Twenty-three thousand, five hundred six
Mathematics
Solve.What is 4.9% of $88,990?
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Mathematics
Add.15 + 2 + (-13)
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Mathematics