If the sum of the measures of the interior angles of a polygon is 1980°, how many sides does it have

Hello from MrBillDoesMath!

n = 13

Discussion:

Generally for a polygon with "n" sides, the sum of the interior angles is given by (n-2)* 180. We need to solve

(n-2) * 180 = 1980                =>  divide both sides by 180

(n-2)          = 1980/180         => as 1980/180 =11

n-2 = 11                                 => add 2 to both sides

n = 11 + 2 = 13

Hence the polygon has 13 sides ( and is called a "triskaidecagon"!)

Thank you,

MrB

a. turk and mcalister

b. howard, mission, and market

c. yes. since streets end some do not cross yet are not parallel to others. example: mcalister and 5th

step-by-step explanation:

parallel lines are lines which do not intersect ever and look a lot like railroad tracks. turk, mcalister and golden gate are examples of these.

intersect are streets which cross each other and a car on one can reach the other. howard, mission, and market intersect with 6th.

skew lines are lines which neither intersect nor are parallel. these lines exist here because some streets end and never intersect another like mcalister and 5th.