Plane Geometry

Question 1

Sum of interior angles

Answer 1

= 180( n-2)

Question 2

Sum of exterior angles

Answer 2

Se = 360°

Question 3

Sum of central angle

Answer 3

Sc = 360°

Question 4

Of diagonals

Answer 4

D= [n ( n-3)] / 2
Where n= # of sides

Question 5

Interior θ of a regular polygon

Answer 5

Si / n
Where n= # of sides

Question 6

Exterior θ of a regular polygon

Answer 6

θe = Se/n

Question 7

Central θ of a regular polygon

Answer 7

= Sc/n

Question 8

Area of a polygon formula

Answer 8

= 1/4 ns^2 cot θc/2
Where:
n = # of sides
S = length of sides