Dollhouse Pizzas

I have compared the area of both the sectors as it is directly proportional to the area of whole octagon.
Radius of small sector and doll sector is $\color{#3D99F6}{\dfrac{12}{\pi}}$ and $\color{#D61F06}{\dfrac{4}{\pi}}$ respectively. $\color{#69047E}{[}$ If in a circle of radius r , an arc of length l subtends an angle $\theta$ radian at the centre , then we have $r = \dfrac{l}{\theta}\color{#69047E}{]}$

Area of small sector = $\dfrac{\pi}{8} \cdot \left(\color{#3D99F6}{\dfrac{12}{\pi}}\right)^2 = \dfrac{18}{\pi}$
Area of doll sector = $\dfrac{\pi}{8} \cdot \left(\color{#D61F06}{\dfrac{4}{\pi}}\right)^2 = \dfrac{2}{\pi}$

$\Rightarrow \dfrac{\text{Area of small vector}}{\text{Area of doll vector}} = \dfrac{9}{1}$

Because the two slice sizes will be similar, 9 doll-slices can fit perfectly together, covering one small slice, therefor the whole whole area of a small pizza will be 9 times larger than the whole area of a doll pizza.

(In other words, a whole small pizza has 8 triangular slices, that could only be covered by $8 \times 9 = 72$ doll-slices in total. $72:8 = 9:1$ )