The polygon have 59 sides.
Solution:
Sum of the measure of interior angle of the polygon = 10260°
Interior angle theorem of polygon,
The sum of measure of interior angles of a polygon is (n – 2) × 180°.
By this theorem,
(n – 2) × 180° = 10260°
Divide by 180° on both sides.
![$((n - 2) * 180^\circ)/(180^\circ) = (10260^\circ)/(180^\circ)](https://img.qammunity.org/2021/formulas/mathematics/college/hhi9bh50jhmfx1sgrt9tl5lycitin1q6yl.png)
![n-2=57](https://img.qammunity.org/2021/formulas/mathematics/college/cv3elrpti4i60vhh7b42st3tskovxriayr.png)
Add 2 on both sides, we get
n – 2 + 2 = 57 + 2
n = 59
Hence the polygon have 59 sides.