Larger Image Background Paper - Trigonometry Gray Trigonometry formulae in muted blacks, grays on off white background. Novelty fabric from Moda's Zen Chic line. Ref # moda1583_16_10c DescriptionUnitPriceQty. Trig Gray Quantity on Hand: 10-1/2 yard yard $10.29 Trig Gray Quantity on Hand: 0 each FQ each FQ $2.90