1. 10-4 surface area of pyramids and cones
Thursday, April 19
10-4 surface area of pyramids and cones

2. Agenda
Check Your Skills
Homework Check
10 -4 Notes
CW / HW

3. Check your Skills
1. Find LA and SA 2. Find LA and SA

4. Homework Check A, C, D 5. C 6. D 7. B 8. A 9. B, C
4. Hexagonal prism 5. LA=120, SA=220
6. LA=96, SA= pi
pi pi
11. LA=11.7pi LA=63pi
16. height=20

5. 10-4 Surface Area of Pyramids and Cones
A Pyramid is a polyhedron in which one face (the base) is any polygon and the other faces (the lateral faces) are triangles that meet at a common vertex (called the vertex of the pyramid)

6. Altitude = Height
Is the perpendicular segment from the vertex to the plane of the base. A regular pyramid is a pyramid whose base is a regular polygon and whose lateral faces are congruent isosceles triangles. The SLANT HEIGHT (l) is the length of the altitude of a lateral face of the pyramid

8. Ex 1 Find the slant height

9. Pyramid

10. Ex 1: Find LA

11. Ex2: Find SA

12. Cones

14. Ex 3: Find LA

15. Ex 4: Find SA

16. Tetrahedron – the net makes 4 equilateral triangles.

17. What shape does the net make?

18. 2.

19. Homework
Complete the worksheet