4.MD.7

Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts.

Lesson 4.MD.7

Concepts addressed:

• Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts.

• Solve addition and subtraction problems to find unknown angles on a diagram in real-world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.

• If given one angle measure is the sum of two or more angles, then find the remaining angle given some of the angles (sounds confusing, but it will make more sense in the worksheet and IXL's)

• Understanding adjacent angled and how they can be added to subtracted to find them

Key terms in this lesson:

• Adjacent angles - angles that are next to each other (you can add and subtract these angles to find larger, or smaller, angles)

• 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

Angle A and B are adjacent

This worksheet went over:

Additional practice:

Lesson Complete!