5-Piece Geometry Ruler Combination Sets. All Rulers are in inches centimeters Geometric Ruler Sets includes: 12″ (30 cm) ruler 4″ (10.2 cm) 30Ëš/ 60Ëš/ 90Ëš triangle ruler 3.25″ (8.25 cm) 45Ëš/90Ëš triangle ruler 4″ (10.2 cm) 180Ëš protractor and 360Ëš Compass ruler