Geometree Christmas Cards, Great for Math Lovers, Geometry Teachers, Stem Students, Geeks and Nerds Celebrate the season with a mathematical marvel! Our Christmas card brings a geometric twist to the holiday spirit as various shapes and equations elegantly converge to form the enchanting silhouette of a Christmas tree. Adorned with precision and care, this card is the perfect ode to math lovers, geometry enthusiasts, and nerds alike. A playful parody of a classic carol exclaims, "Oh Geometree, Oh Geometree, your angles are so lovely." Share the joy of mathematics and the festive cheer with those who appreciate the beauty of both numbers and holiday traditions. These high-quality paper cards come pre-folded, packed in cello sleeves per 10 cards, and include a white envelope for each card. Works well with regular ballpoint pens after a short drying time. Size: 5"x7" Blank inside. Comes with envelopes.