Finding Angles in Polygons

If the sum of the interior angles of a polygon equals 900°, how many sides does the polygon have? 

• 7
• 9
• 10
• 12

What is a polygon called if the sum of its interior angles equals 1440° ?

• Octogon
• Nonagon
• Decagon
• Dodecagon

What is the value of x?

• 26.25
• 38.75
• 24
• 25.125

Look at this convex polygon.How many triangles are formed by drawing all the diagonals from a single vertex?

• 2
• 3
• 4
• 1

Find the value of x

• 87°
• 54°
• 101°
• 92°

An exterior angle of a regular polygon
measures 36°. How many sides does
the polygon have? 

• 10
• 5
• 14
• 9

The measurement of the sum an interior
angle of a regular nonagon is 1080°

• True
• False

Find the value of x

• 141
• 150
• 135
• 163

Find the sum of the interior of angles in a 12-gon

• 1800
• 1080
• 1620
• 1260

Find the measureof the sum of the exterior angles in a hexagon

• 360
• 180
• 720
• 540