ul li1 Angles in Cover Artbr Elise Elliottbr September 2009br li ul p2 Acute Anglebr 3 Right Anglebr 4 Obtuse Anglebr 5 Complementary Anglesbr 6 Supplementary Anglesbr 7 Bisected Anglebr 8 Vertical Anglesbr 9 Linear Pairbr 10 Opposite Raysbr p