Upload
others
View
4
Download
0
Embed Size (px)
Citation preview
Success Criteria
Aim• I can compare, classify and find unknown angles in polygons.
• I can find unknown angles in polygons.
• I can sort polygons using Venn and Carroll diagrams based on their properties.
Polygon Angle PropertiesTo calculate a missing angle of a polygon we need to know the sum of
the interior angles of the polygon with the missing angle.
Use this formula to calculate the sum of the interior angles of a polygon:
( – 2) x 180number of sides
Polygon Interior AnglesUse the formula (number of sides – 2) × 180 to calculate the total
interior angles of the irregular polygons.
Polygon Missing Angles
113°
?°
If the sum of the interior angles of a pentagon is (5 - 2) x 180 = 540°, when four of the angles are given, we can calculate the missing angle.
Q: The pentagon ABCDE has: Angle A measuring 113°Angle B measuring 125°Angle C measuring 90°Angle D measuring 93°What is the measurement of angle E?
125°
93°
90°
A
B
C
D
E