Before you have access to this lesson from the links below, click on “**Materials**” to see what’s covered. The exercise is expected to last for not more than 1 hour 3o minutes, and please, be ready to complete this lesson in **ONE** session. If you haven’t signed up for the IXL SKILLS package, the temporal login info that you purchase from the link below, will be valid for 48 hours.

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Warmup: Drag the squares to form nets of a cube. See example on the left.

(1.) A net is a 2-dimensional representation of a 3-dimensional object. True or False?

(2.) Not all polygons can be opened out into a net. True or False?

**Activity #1** (30 minutes)

1. Topic: Cross sections of three-dimensional figures(Applet).

2. Explainer Video: Cross sections of three-dimensional figures.

**Practice Exercise** (30 minutes).

Topic: Cross sections of three-dimensional figures.

**Quiz Time** – (Two sets: 30 minutes).

Topic: Cross sections of three-dimensional figures (to be taken while you are logged in).

- An applet.
- Explainer video on "Cross sections of three-dimensional figures".
- Exercise questions on "Cross sections of three-dimensional figures". The questions exhibit an increasing order of difficulty.
- Two sets of quizzes on "Cross sections of three-dimensional figures". The questions exhibit an increasing order of difficulty, and an average score of 80% expected.

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