reed to dividea right angle into ninety equal parts, called degrees,and indicated thus, 90^ (ninety degrees). An acuteangle is any angle less than 90^. The angle formedby the lines eo and bo, being one-third of a rightangle, is an acute angle of 30^ (thirty degrees). Anobtuse angle is any angle… … 1 68 TEACHERS MANUAL. fourth of any circle ; as, ac, large or small: henceany whole circle has 360 degrees. When a degreemeasures the ditierence in direction of any twostraight lines, it always means the ninetieth part ofa right angle ; when applied to a circle, it alwaysmeans the three hundred and…
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