running mermaid and latex not workin

I keep getting errors when trying mermaid and latex syntax:

```

```mermaid
pie title What Voldemort doesn't have?
         "FRIENDS" : 2
         "FAMILY" : 3
         "NOSE" : 45
```

```

```

```math
a^2+b^2=c^2
```

```

gives me: 

Error: 
illegal character: '`'

