Answer:
14 inches.
Explanation:
We have been given that Leslie buys a large Circular pizza that is divided into eight equal slices.
![\text{Circumference of circle}=2\pi r](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ctjh9241ozxpef2y41qe24mxt8mgpxypml.png)
Since the given pizza is divided into 8 equal parts, so circumference of one part will be:
![\text{Circumference of one part of pizza}=(2\pi r)/(8)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ojpfu56wdiax83l8vrxv4k3o68lk6adqn7.png)
![\text{Circumference of one part of pizza}=(\pi r)/(4)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/b8sbkb96h9ubtvz8ixrs69jfaei2d1pwyw.png)
We have been given that Leslie measures along the outer edge of the cross from one piece to be 5.5 inches.
![5.5=(\pi r)/(4)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/swwc6tl04fwq13y2z89lqydfgpolvgk287.png)
![5.5*4=(\pi r)/(4)*4](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ztxiql2lathxi3hb0avc187glxpq5bmdeh.png)
![22=\pi r](https://img.qammunity.org/2019/formulas/mathematics/middle-school/kukamiogjkcyejxqavvxwyqqiukh6ohw58.png)
![(22)/(\pi)=(\pi r)/(\pi)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/93qa3d3xpq7cq4ci40mbx656xc89bevni9.png)
![7.006369=r](https://img.qammunity.org/2019/formulas/mathematics/middle-school/3hmkg7tjs4ugmvela2al457so6r86xglb5.png)
![r\approx 7](https://img.qammunity.org/2019/formulas/mathematics/middle-school/vduqzig5bntcyrq57vmjcsshgdhiulxpli.png)
Since diameter is 2 times the radius, so diameter of pizza would be
![7* 2=14](https://img.qammunity.org/2019/formulas/mathematics/middle-school/y6fyxnvds1j9n39zhbge68tpklw9c6rx88.png)
Therefore, the diameter of pizza is 14 inches.