1. a) KKK b) BKB c) BKB
2. a)
[tex]1^{2} + (1\frac{1}{3} )^{2} =(1\frac{2}{3} )^{2} \\1^{2} + \frac{4}{3}^{2} =\frac{5}{3}^{2}\\1+\frac{16}{9} =\frac{25}{9}\\[/tex]
3.
A(-2, -1) B(5, 6) C(1, 3)
[tex]|AB|=\sqrt[]{ [5-(-2)]^{2} + [6-(-1)]^{2}} = \sqrt{7^{2}+7^{2}}=7\sqrt{2} \\|AC|=\sqrt{[1-(-2)]^{2}+[3-(-1)]^{2} } =\sqrt{3^{2}+4^{2} } =\sqrt{9+16}=\sqrt{25}=5\\|BC|=\sqrt{(5-1)^{2}+(6-3)^{2} } =\sqrt{4^{2}+3^{2} } =\sqrt{16+9}=\sqrt{25}=5 \\L=7\sqrt{2}+5+5=10+7\sqrt{2}[/tex]
