Maligayang pagdating sa Imhr.ca, kung saan maaari kang makakuha ng mga sagot mula sa mga eksperto. Maghanap ng mapagkakatiwalaang sagot sa iyong mga tanong mula sa malawak na komunidad ng mga eksperto sa aming madaling gamitin na platform. Tuklasin ang malalim na mga sagot sa iyong mga tanong mula sa isang malawak na network ng mga propesyonal sa aming madaling gamitin na Q&A platform.

The sum of the interior angles of a triangle is 180º; of a quadrilateral is 360º and of a pentagon is 540º. Assuming this pattern continues, what is the sum of the interior angles of a 10-sided polygon?

Sagot :

Sum of interior angles in a polygon = 180 (n-2)  where n = number of sides

A ten-sided polygon, obviously, has 10 sides (decagon).

The sum of the interior angles of decagon = 180 (n-2)
                                                             = 180 (10-2)
                                                             = 180 (8)
                                                             =  1,440 degrees

Explanation of the pattern:
Why n-2?  
It is the expression in finding the number of triangles in a polygon, where n=number of sides. The sum of interior angles of triangle is 180 degrees.  Multiply 180 degrees by the number of triangles in a polygon yields the sum of the interior angles of the same polygon.


Decagon has 8 triangles inside it (10 sides - 2).  Multiply the number of triangles by 180 degrees, the result is 1,440 degrees.