The Great Pyramid of Giza can be modelled by a right-pyramid with a square base.
-;0x4 0dhnh;-se,2f goy2nbd7 /d ftokljdxk A scale model of
ldtf xkj og 4,n;0/no0;kdy 2bdx-hh-d7 es2f the Great Pyramid of Giza is shown below.
The vertices $\mathrm{A}$, $\mathrm{B}$ and $\mathrm{C}$ have coordinates $\mathrm{A}$(1,5.5,0), $\mathrm{B}$(6.5,0,7) and $\mathrm{C}$(12,5.5,0) relative to a fixed origin O near the pyramid. All distances are measured in centimetres.
1. 1. Find $\overrightarrow{\mathrm{AB}}$ .
2. Find $\overrightarrow{\mathrm{AC}}$ .
2. Find $\overrightarrow{\mathrm{AB}} \times \overrightarrow{\mathrm{AC}}$ .
3. Hence, or otherwise, find the surface area of the scale model, not including the base. ≈
$cm^2$