Obtuse Angles. All angle greater than a rightangle is called an obtuse angle. This figure at H shows what ismeant by greater than a rightangle. Draw a horizontal line asin I ] then an oblique line,joining the horizontal line atits centre; and then a thirdline, perpendicular to theI. second line.… … 28 TEACHERS* MANUAL. angle and one obtuse angle; the former to theright of the oblique line, the latter to the left. Theunion of the two oblique lines forms two right angles.Thus draw the different angles in various posi-tions, and require the pupils to name the angles,until they can readily…
Drawing -- Study and teaching
Internet Archive · New York Public Library · Public Domain Mark 1.0. Free to use for anything.
