1.

find the length of an arc of a circle which subtends an angle of 108 degree at the center,if the radius of the circle is 15cm.

Answer»

Radius = 15cm.

degree measure = 108 degree.

lenght of arc (L) = FIND it.

radian mesure =  py / 180 . degree measure .

                           =     py / 180 .108.

                          =     3PY / 5.

length of arc = radius . ANGLE .

                      = 15 . 3py / 5.

                      =3 . 3 py.

                     = 9py.

                     = 9 . 22 / 7.

                     =198 / 7 .

                     =  28.2. 


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