Trigonometry made simple?

My eldest told me yesterday about her maths lesson at school.  It seems one of her class’s exercises showed a diagram similar to the one shown to the left.

The question they were set was to “FIND X“:

I know as a grown up I shouldn’t find it funny, but I couldn’t stop laughing when she drew what a friend of hers gave back to the teacher at the end of their lesson.

It was this:

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