INTERIOR ANGLES OF A REGULAR POLYGON WORKSHEET

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Problem 1 :

Solve for x.

Solution

Problem 2 :

Solve for x.

Solution

Problem 3 :

Solve for x.

Solution

Problem 4 :

The sum of the angles of a polygon is 1980°. How many angles has the polygon?

Solution

Problem 5 :

Juan claims to have found a polygon which has angles with a sum of 2500°. Comment on Juan’s finding.

Solution

Problem 6 :

An exterior angle and the interior angle of a regular polygon are in the ratio 2 : 7. Find the number of sides of a polygon.

Solution

Problem 7 :

Four angles of a quadrilateral are in the ratio of 3 : 4 : 5 : 6. Find its angles.

Solution

Problem 8 :

exterior-angles-of-polygon-q1.png

Solution

Problem 9 :

exterior-angles-of-polygon-q2.png

Solution

Problem 10 :

exterior-angles-of-polygon-q3.png

Solution

Problem 11 :

exterior-angles-of-polygon-q4.png

Solution

Answer Key

1) x° = 151°

2)   x° = 108°

3)  x° = 110°

4)  n = 13

5)  n = 15.8 (not)

6) the required interior angle exterior angles are 40 and 140 degree respectively.

7)  the required angles are 60, 80, 100 and 120.

8) the exterior angle of the polygon shown is 144 degree.

9) the exterior angle of the polygon shown is 117 degree.

10) the exterior angle of the polygon shown is 81 degree.

11) the exterior angle of the polygon shown is 132 degree.

Problem 1 :

Find the number of sides of a regular polygon which has angles of 150°

Solution

Problem 2 :

Is there a regular polygon which has the angle of 158°

Solution

Problem 3 :

For the following regular polygon given below,

a) Equilateral triangle

b) Square

c) Pentagon

d)  Hexagon

e) Octagon

f) Decagon

find

(i)  Number of sides that the polygon has

(ii) Number of angles

(iii)  Size of each angle.

Solution

Problem 4 :

In an equilateral hexagon, four of the exterior angles each have a measure of x°. The other two exterior angles each have a measure of twice the sum of x and 48. Find the measure of each exterior angle.

Solution

Problem 5 :

Is the hexagon a regular hexagon. Explain your reasoning.

problems-on-regular-polygon-q1

Solution

Problem 6 :

Describe and correct the error in finding the measure of one exterior angle of a regular pentagon.

problems-on-regular-polygon-q2.png

Problem 7 :

Find the number of sides for the regular polygon described.

Each interior angle has a measure of 156°.

Solution

Problem 8 :

A home plate for a baseball field is shown.

a. Is the polygon regular? Explain your reasoning.

b. Find the measures of ∠C and ∠E.

problems-on-regular-polygon-q3.png

Solution

Answer Key

1)  n = 12

2) Not a polygon

3)  a)  60°  b)   90°  c)  108°  d)  120  e)  135°  f)  144°

4) the required angle are 21, 21, 21, 21, 138 and 138.

5) If it is regular polygon, then the interior angle should be the same. Since the interior angle measures are not the same, it cannot be a regular hexagon.

6) 72 degree is the exterior angle.

7) the number of sides of a regular polygon is 15.

8) a) The polygon is not equilateral or equiangular. So, the polygon is not regular

b) m∠C = m∠E = 135°.

Problem 1 :

Find the size of each angle of a regular 12 sided polygon.

Problem 2 :

Each exterior angle of a regular polygon is 20⁰. Work out the number of sides of the polygon.

Answer Key

1) 150 degree.

2)  18 sides.

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