Lesson 1-4 Angle Measure

Ohio Content Standards:

Formally define geometric figures. Recognize and apply angle relationships in situations involving intersecting lines, perpendicular lines and parallel lines.

Vocabulary:

Vocabulary: Degree -Degree -

Vocabulary: Degree –Degree – A unit of measure used in measuring angles and arcs.

Vocabulary: Ray –Ray –

Vocabulary: Part of a line that has one endpoint and extends indefinitely in one direction. AB

Vocabulary: OppositeOpposite Rays –

Vocabulary: OppositeOpposite Rays – Two rays BA and BC such that B is between A and C. BCA

Vocabulary: Angle –Angle –

Vocabulary: Formed by two noncollinear rays that have a common endpoint. B 4 A C Side AB Side AC Vertex A

Vocabulary: Sides –Sides –

Vocabulary: The two noncollinear rays that form an angle.

Vocabulary: Vertex –Vertex –

Vocabulary: The common endpoint of the two noncollinear rays that form an angle.

Vocabulary: Interior –Interior –

Vocabulary: A point that lies on the inside of an angle. D Point D is in the interior of the angle

Vocabulary: Exterior –Exterior –

Vocabulary: A point that lies on the outside of an angle. E Point E lies in the exterior of the angle

G F E D B A

G F E D B A Name all angles that have B as a vertex. Name the sides of 5. Write another name for 6.

G F E D B A Name all angles that have B as a vertex. Name the sides of 5. Write another name for 6.

G F E D B A Name all angles that have B as a vertex. Name the sides of 5. Write another name for 6.

Vocabulary:

Vocabulary: Right Angle –Right Angle –

Vocabulary: An angle that measures exactly 90°.

Vocabulary: Acute Angle –Acute Angle –

Vocabulary: An angle that measures less than 90°.

Vocabulary: Obtuse Angle –Obtuse Angle –

Vocabulary: An angle that measures between 90° and 180°.

Vocabulary: Angle Bisector –Angle Bisector –

Vocabulary: A ray that divides an angle into two congruent angles.

Classify each angle named as right, acute, or obtuse. Y X W V U T S

Y X W V U T S

Y X W V U T S

Y X W V U T S

Wall stickers of standard shapes are often used to provide a stimulating environment for a young child’s room. A five-pointed star sticker is shown with vertices labeled. Find K J I HG E D C B A

Assignment: Pgs all, all