4.MD.6

Measure angles in whole number degrees using a protractor. Sketch angles of specified measure.

Lesson 4.MD.6

Concepts addressed:

• Measure acute, obtuse, and right angles in whole-number degrees using a protractor

• Sketch angles of specified measure using both sides of the protractor

• Using both sides of the protractor, be able to draw an acute, obtuse, and/or right angle

• Be able to estimate a given angle using a protractor (i.e. if an angle is roughly at 68 or 69 degrees, estimate that it is close to 70 degrees)

Key terms for this lesson:

• Protractor - A protractor is a measuring instrument, typically made of transparent plastic or metal, for measuring angles

• Angle - the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.

• Polygons - a figure with at least 3 sides and 3 angles, on top of that, it cannot have any curved sides

• Quadrilaterals - shapes that have four sides and four right angles

• Point - a point in geometry is a location. It has no size i.e. no width, no length and no depth. A point is shown by a dot.

• Line - a line can be defined as a straight one-dimensional figure that has no thickness and extends endlessly in both directions.

• Line segment - a line segment is a piece or part of a line having two endpoints. Unlike a line, a line segment has a length.

• Ray - a ray is a line with a single endpoint

Protractor measuring angles

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