Mathematics
Grade9
Easy

Question

Find the sum of measures of interior angles of a nonagon.

  1. 1080o
  2. 1260o
  3. 540o
  4. 720o

hintHint:

Sum of internal angles of a polygon =( n-2) x 180

The correct answer is: 1260o


    1260
    In a nonagon , number of sides  n = 9
    Sum of internal angles of a polygon =( n-2) x 180
    = (9-2) x 180
    =  7 x 180
    = 1260 degrees

    Sum of internal angles = (n-2) x 180
    the sum of external angles of a polygon =360
    these are properties of polygons.

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