Isosceles

Obtuse

Equilateral

Scalene

$40\degree$

$140\degree$

$80\degree$

$100\degree$

117

94

149

31

x = 27

x = 53

x = 49

x = -16

71

98

109

82

30

45

60

90

Side AB

Side BC

Side AC

$\angle\ A$

$\angle\ B$

$\angle\ C$

$AB\ \cong\ DF$

$DE\ \cong\ AC$

$\Delta\ ABC\ \cong\ \Delta DFE$

$\Delta ABC\ \cong\Delta\ DEF$

 $\angle ACB\ \cong\ \angle\ DFE$  

 $\angle\ BAC\ \cong\ \angle\ FDE$  

 $\angle CAB\ \cong\angle FED$  

 $\angle ABC\ \cong\ \angle\ DEF$  

 $55\degree$ 

 $42\degree$  

 $96\degree$  

 $83\degree$  

x = 60

x = 55

x = 15

x = 65

x = 10

x = 4

x = 5

x = 39