177 Angles in a semicircle are 90 degrees

176 Relationship of n-sided and 2n-sided polygons sharing the same circumscribed circle

175 96-gon polygon cutting side

174 48-gon polygon cutting side

173 24-gon polygon cutting side

172 Triangle for proof of Archimedes' Approximation of Pi

171 A dart geometric shape

170 A kite geometric shape

169 A trapezoid geometric shape

168 A rhombus geometric shape

167 A square geometric shape

166 A rectangle geometric shape