Embedded Files
Registration open for 2025 classes...
Content
Content
Angles - Acute, Right, Obtuse, Straight, Reflex
Angles Around a Point
Corresponding Angles
Alternate Angles
Interior Angles
Angles in a Polygon
Angles - Acute, Right, Obtuse, Straight, Reflex
Angles - Acute, Right, Obtuse, Straight, Reflex
Acute - Angles that are less than 90°
Right - Angle that is exactly 90°
Obtuse - Angles that are more than 90° but less than 180°
Straight - Angle that is exactly 180°
Reflex - Angles that are more than 180°
Angles around a Point
Angles around a Point
Line AB is a straight line.
Line EF intersect AB.
a + b + c + d = 360°
Sum of angles around a point is 360°.
Corresponding Angles
Corresponding Angles
Tip: Look for angles formed by F.
AB and CD are Parallel. Line EF intersects both AB and CD.
Angles a and b are Corresponding Angles and they are equal.
Similarly, angles c and d are Corresponding Angles and they are equal too.
Alternate Angles
Alternate Angles
Tip: Look for angles formed by Z or N.
AB and CD are Parallel. Line EF intersects both AB and CD.
Angles a and b are Alternate Angles and they are equal.
Similarly, angles c and d are Alternate Angles and they are equal too.
Interior Angles
Interior Angles
Tip: Look for angles formed by Z or N.
AB and CD are Parallel. Line EF intersects both AB and CD.
Angles a and b are Interior Angles and their total is 180°.
Similarly angles c and d are Interior Angles and their total is 180°
Angles in a Polygon
Angles in a Polygon
This a regular polygon (all sides are equal) with 5 sides.
Sum of internal angles = (n-2) x 180° = (5-2) x 180° = 540°
So each internal angle = 540/5 =108°
Sum of external angles = 360°
So each external angle = 360°/5 = 72°
Question
Question
Each interior angle of a regular polygon is 150°. Find the number of sides in the polygon.
Each exterior angle of a regular polygon is 20°. Find the number of sides in the polygon.
Each interior angle of a regular polygon is 5 times the exterior angle. Find the number of sides in the polygon.
Google Sites
Report abuse