I created a Desmos activity on Similar Triangles a while ago. A teacher recently let me know that on slides 8, 9, and 10, all the ∆ symbols are being replaced with “fj.” For example, on slide 8, ∆BAC ~ ∆YZX appears as fjBAC ~ fjYZX. The symbols display correctly on the editing page, but they change when viewed in the preview. What can I do to prevent this from happening?
That may have to do with it being a plaintext character. Try converting them to latex instead (i.e. highlight the text and press the ` key which is next to the 1 key).