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* Two rays that share the same endpoint form an angle. The point where the rays intersect is called the vertex of the angle. The two rays are called the sides of the angle. Two rays that share the same endpoint form an angle. The point where the rays intersect is called the vertex of the angle. The two rays are called the sides of the angle.

* We can specify an angle by using a point on each ray and the vertex. * The angle below may be specified as angle ABC or as angle CBA. * you may also see this written as ABC or as CBA. Note how the vertex point is always given in the middle.

* An acute angle is an angle measuring between 0 and 90 degrees.

* An obtuse angle is an angle measuring between 90 and 180 degrees.

* A right angle is an angle measuring 90 degrees. Two lines or line segments that meet at a right angle are said to be perpendicular. Note that any two right angles are supplementary angles (a right angle is its own angle supplement).

Protractors usually have two sets of numbers going in opposite directions. Be careful which one you use!

* Find the center hole on the straight edge of the protractor. * Place the hole over the vertex, or point, of the angle you wish to measure. * Line up the zero on the straight edge of the protractor with one of the sides of the angle. * Find the point where the second side of the angle intersects the curved edge of the protractor. * Read the number that is written on the protractor at the point of intersection. This is the measure of the angle in degrees. A protractor is a tool used to measure angles

* Angle Games *

* A) Two rays that share the same endpoint form an angle. The point where the rays intersect is called the vertex of the angle A) * B) A triangle that has congruent sides B) * C) A circle C) * D) A book about birds D)

* A) Meters A) * B) Millimeters B) * C) Kilograms C) * D) Degrees D)

* A) ACB A) * B) CAB B) * C) ABC C) * D) EFG D)

* A) Right, left, front A) * B) Right, obtuse, acute B) * C) Right, left, acute C) * D) Right, obtuse, front D)

* A) Greater than 90 degrees A) * B) Equal to 90 degrees B) * C) Less than 90 degrees C) * D) Greater than 85 degrees D)

* Angles and angle terms. (2006). Retrieved from htm Protractor. (2009). Retrieved from * Protractor. (2009). Retrieved from * Weatherall, Peter (Producer). (2009, August 20) Code Angles [music video]. Retrieved March 31, 2010 fromhttp:// Credits