A review by jessthebibliophile
Three Sides of a Heart: Stories about Love Triangles by Natalie C. Parker

*** Riddles in Mathematics (KATIE COTUGNO) - A contemporary tale of a teenage girl who recently came out to her family and has a crush on her brother's BFF, who she believes is her brother's soulmate.
** Triangle Solo (GARTH NIX) - A barely there love triangle between 2 guys who are best friends and their reunion with a girl who had been their childhood comparison. The boys live off world, but the story was too short to flesh out the characters or world building.