What was the geometry student looking for at the beach

失落的我

Q: What was the geometry student looking for at the beach?
& i9 _5 A; i8 [5 j7 f4 j
. f) N  h/ x; E; C" v  YA: A tangent.
8 P9 |) h5 z7 f3 v0 |
7 E6 K* [7 g+ O! Itangent  
" k# J# X: z9 w9 e" u3 f5 y6 b/ }3 b noun
(geometry) a straight line that touches the outside of a curve but does not cross it