Lesson 1 4 Angle Measure Ohio Content Standards

Lesson 1 -4 Angle Measure

Ohio Content Standards:

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 -

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

Vocabulary: • Ray –

Vocabulary: • Ray – • Part of a line that has one endpoint and extends indefinitely in one direction. A B

Vocabulary: • Opposite Rays –

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

Vocabulary: • Angle –

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

Vocabulary: • Sides –

Vocabulary: • Sides – • The two noncollinear rays that form an angle.

Vocabulary: • Vertex –

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

Vocabulary: • Interior –

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

Vocabulary: • Exterior –

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

G B 5 6 E F A D 3 4

G B 5 6 A D 3 E 4 F • Name all angles that have B as a vertex. • Name the sides of 5. • Write another name for 6.

G B 5 6 A D 3 E 4 F • Name all angles that have B as a vertex. • Name the sides of 5. • Write another name for 6.

G B 5 6 A D 3 E 4 F • Name all angles that have B as a vertex. • Name the sides of 5. • Write another name for 6.

Vocabulary:

Vocabulary: • Right Angle –

Vocabulary: • Right Angle – • An angle that measures exactly 90°.

Vocabulary: • Acute Angle –

Vocabulary: • Acute Angle – • An angle that measures less than 90°.

Vocabulary: • Obtuse Angle –

Vocabulary: • Obtuse Angle – • An angle that measures between 90° and 180°.

Vocabulary: • Angle Bisector –

Vocabulary: • Angle Bisector – • A ray that divides an angle into two congruent angles.

Video Link: • http: //www. teachertube. com/ video/math-rocks-songabout-angles-80141

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

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

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

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

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 B G A H K C I J E D

Assignment: Pgs. 34 - 36 12 -36 all, 52 -60 all