<a href="https://www.gwegogledd.cymru/index.php/pisavle/cymraeg/?lang=en"><!-- [et_pb_line_break_holder] --><div class="pisaVLE_submenu_item cymraeg"></div><!-- [et_pb_line_break_holder] --></a><!-- [et_pb_line_break_holder] --><a href="https://www.gwegogledd.cymru/index.php/pisavle/saesneg/?lang=en"><!-- [et_pb_line_break_holder] --><div class="pisaVLE_submenu_item saesneg"></div><!-- [et_pb_line_break_holder] --></a><!-- [et_pb_line_break_holder] --><a href="https://www.gwegogledd.cymru/index.php/pisavle/mathemateg/?lang=en"><!-- [et_pb_line_break_holder] --><div class="pisaVLE_submenu_item maths"></div><!-- [et_pb_line_break_holder] --></a><!-- [et_pb_line_break_holder] --><a href="https://www.gwegogledd.cymru/index.php/pisavle/gwyddoniaeth/?lang=en"><!-- [et_pb_line_break_holder] --><div class="pisaVLE_submenu_item gwydd"></div><!-- [et_pb_line_break_holder] --></a>
20G Congruency and Quadrilaterals