1. The great pyramid of Khufu is located in Egypt in the Valley of the Kings.
It took years to build and is made of 2.3 million blocks of limestone and granite.

2. Those pyramids look very steep. I am glad we don’t have to climb them.
Which angle are you talking about?

3. Create a drawing on squared paper to estimate both angles?
Which of the two angles is greatest, the ‘face on’ angle or the ‘edge on’ angle?
440 cubits
622 cubits
Face on
Edge on
280 cubits
Create a drawing on squared paper to estimate both angles?
What are the lengths of the slant height and edge?

4. 280
356
220
440
418

5. The first great Greek mathematician, Thales (623 – 545 BC), asked the Egyptian priests about the height of the great pyramid.

6. The priests refused to tell him so Thales used the shadow of a stake in the ground to estimate the height.
How did he do it?
What was the height to the stake and the length of the two shadows? ?

7. Thales assumed that the rays of the sun were parallel.
That meant that the triangles were similar.

8. 3 cubits
2 cubits
186 cubits
? cubits