Showing My Life as a Rhombus by Varian Johnson

My Life as a Rhombus When forced to tutor Sarah Gamble in trigonometry, Rhonda Lee recognizes all too well the symptoms - queasiness, puking, and exhaustion - that Sarah is trying to mask. On a sudden impulse, Rhonda shares her past with Sarah. Exchanging their secrets adds up to more truths than either girl would have dreamed.