1. Pyramid or not?
Why?

2. What is the film? https://www.youtube.com/watch?v=YVOPYFU168k
Despicable me. Play the clip from 0:57 till the end
0:57 - end

3. Think about the ‘fake’ pyramid … What do you think it was made from
Think about the ‘fake’ pyramid … What do you think it was made from? How much material do you think was needed to make it? Discuss: What information would you need to know?

4. What information would you need to know?

5. We want to know the amount of material required.
In other words, we want the area of all the outside faces

6. We are trying to find the surface area of the pyramid

7. This is the Great Pyramid.
We know from last lesson that the base length is m and its slant height is m.
How does this help?

8. It is easier to find the surface area from a net

9. It is easier to find the surface area from a net

10. Find the surface area of the Great Pyramid

11. Find the surface area of the Great Pyramid
SA = m2

12. Find the surface area of the following pyramids:
SA = (25 x 25) x 25 2
SA = (400)
SA = 2225 feet2
PRINT

13. Find the surface area of the following pyramids:
SA = (40 x 40) x 40 2
SA = (1880)
SA = 9120 cm2
PRINT

14. What is different this time?
This time we are given the edge length of the pyramid

15. What is different this time?
Which length do we need to find the surface area?

16. What is different this time?
Slant
height
How can we use the edge length to help us find the slant height?

17. What is different this time?
Slant
height
85cm
12cm
What will the dimensions be? How can we find the slant height?

18. What do the small lines on the base of the pyramid represent?

19. What is different this time?
This time we are given the perpendicular height of pyramid

20. What is different this time?
Which length do we need to find the surface area?

21. What is different this time?
Which length do we need to find the surface area?

22. What is different this time?
Slant height
How can we use the perpendicular height to help us find the slant height?

23. What is different this time?
10cm
Slant height
3cm
What will the dimensions be? How can we find the slant height?

24. Find the surface area of the following pyramids:
HINT: Find the slant height first …
SA = (6 x 6) x 6 2
SA = (3 91 )
SA = m2
SA = m2

25. Find the surface area of the following pyramids:
HINT: Find the slant height first …
SA = (20 x 20) x 20 2
SA = …
SA = cm2

26. The surface area of this pyramid is 480 cm2 Find the base length
Challenge:
The surface area of this pyramid is 480 cm2 Find the base length
14cm

27. Resources

29. Find the surface area of the following pyramids:
PRINT - 2 per page for each student

30. Find the surface area of the following pyramids:
PRINT

31. Find the surface area of the following pyramids:

32. Find the surface area of the following pyramids: