In isosceles ?ACB, AC ? BC , in isosceles ?AFB, AF ? BF. Prove that ?EBC ? ?DAC.
(Outline) ?CAB ? ?CBA by Thm 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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Perform the indicated operations and simplify the result. Leave the answer in factored form.
A. 
B. 
C. 12
D. 1
Mathematics
Evaluate the expression.
- 
A. -1719 B. -1803 C. 1719 D. -39
Mathematics
Perform the indicated operation.(
+ 
)(
- 
)
A. 8 - 2
B. 1
C. 8 - 4
D. 15
Mathematics
Find an equation for the line. Write the equation in standard form.Through (3, -7) and (-1, 10)
A. -17x + 4y = 23 B. -10x + 11y = -100 C. 10x - 11y = -100 D. 17x + 4y = 23
Mathematics