Simplify each expression. Bell Ringer Simplify each expression. 1. 3(x + 1) 2. (z + 2) 6 3. 6 + 2(m + 4) 4. 12 + w + 4 + 5w

Announcements Quiz on Monday (12.1 and 12.2) Test on Friday (12.1, 12.2, 12.3, & 12.4) Projects due TOMORROW

Homework Check

Homework Check

Open Notes Quiz 1. What are the two dimensions of a 2D figure? 2. What are the three dimensions of a 3D figure? 3. A ______ is where 2 planes intersect in a line. 4. A _______ is a flat surface. 5. A _______ is where 3 or more planes intersect at a point. 6. What is a polyhedron with 2 parallel, congruent bases? 7. What is a polyhedron with one base?

Section 12.1: 3D Figures R drive > Key > March 30_April 3 > 3_31__12.1 Three Dimensional Figures Cont File > Save As > P drive > Math > March 30_April 3

Vocabulary Cross Section- The intersection of a figure and a plane Parabola – The shape that results from an angled slice through a cone

Example 1 Cross Sections

Example 2 Cross Section Draw and describe the shape resulting from a vertical, angled, and horizontal cross section of a triangular pyramid.

Example 3 Cross Section Draw and describe the shape resulting from a vertical, angled, and horizontal cross section of a rectangular pyramid.

Example 4 Describe and Draw A fluorite crystal is shown at the right. Draw the top view and side view. Then draw and describe the shape resulting from a vertical cross section of the figure.

Example 5 Describe and Draw Lemar and his brother went camping for the weekend. They set up the tent at the right. Draw the top view and side view. Then draw and describe the shape resulting from a vertical cross section of the figure.

Example 6 Describe and Draw A gift box is shown below. Draw the top view and side view. Then draw and describe the shape resulting from a vertical cross section of the figure.

Homework Section 12.1 #3 – 6, 13 - 16

Homework Section 12.1 # 3-6, 13-16