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${60^ \circ }$

${70^ \circ }$

${90^ \circ }$           

${120^ \circ }$

$\Delta BAD = \Delta HIK$           

$\Delta ABD = \Delta KHI$

$\Delta DAB = \Delta HIK$           

$\Delta ABD = \Delta KIH$

$\Delta BAD = \Delta HIK$           

$\Delta ABD = \Delta KHI$

$\Delta DAB = \Delta HIK$           

$\Delta ABD = \Delta KIH$

$\widehat {CAC'} > \widehat {CBC'}$

$\widehat {CAC'} < \widehat {CBC'}$     

$\widehat {CAC'} = \widehat {CBC'}$     

$\widehat {CAC'} = 2.\widehat {CBC'}$

$\widehat {BCA} = \widehat {BAC'}$

$\Delta ACB = \Delta BAC'$

$\widehat {BCA} = \widehat {ABC'}$       

$\Delta ACB = \Delta BC'A$

$\widehat {BCA} = \widehat {BAC'}$

$\Delta ACB = \Delta BAC'$

$\widehat {BCA} = \widehat {ABC'}$       

$\Delta ACB = \Delta BC'A$

$\Delta ABC = \Delta ACD$ 

$\Delta ABC = \Delta CDA$   

$\Delta ABC = \Delta ADC$ 

$\Delta ABC = \Delta CAD$