home *** CD-ROM | disk | FTP | other *** search
/ Eyewitness: Encyclopedia of Science / Mac_DorlingKindersley_EyewitnessEncyclopediaOfScience.iso / mac / MATH / ANGL / ANGL0N0M.WAV (.mp3) < prev    next >
Waveform Audio File Format  |  1995-06-29  |  477.8 KB  |  1 channel  |  22,050 sample rate  |  43 seconds  |  [TEXT/LMAN]
Transcription: Angles are formed where two straight lines meet. They can be measured using a protractor or an angle indicator. Angles are measured in units called degrees. A degree is obtained by dividing the circumference of a circle into 360 equal-sized parts. Mathematicians use a small circle as a symbol to indicate degrees. The angle it occurs at the corners of squares and other rectangles is 90 degrees and is called a right angle. Angles of less 90 degrees are called acute angles. Angles measuring between 90 and 180 degrees are called obtuse angles. Angles measuring between 180 degrees and 360 degrees a ...