1. The problem asks to measure and classify triangles by their angles and sides. 2. To classify by angles: - Acute triangle: all angles less than 90° - Right triangle: one angle exactly 90° - Obtuse triangle: one angle greater than 90° 3. To classify by sides: - Equilateral triangle: all three sides equal - Isosceles triangle: two sides equal - Scalene triangle: no sides equal 4. Since no specific angle or side measurements are provided, we cannot calculate exact values for \(\angle A, \angle B, \angle C, \angle D, \angle E, \angle F, \angle G, \angle H, \angle I, \angle J, \angle K, \angle L\). 5. To classify each triangle, measure each angle and side length using a protractor and ruler. 6. Then apply the rules: - If all angles < 90°, triangle is acute. - If one angle = 90°, triangle is right. - If one angle > 90°, triangle is obtuse. - If all sides equal, triangle is equilateral. - If two sides equal, triangle is isosceles. - If no sides equal, triangle is scalene. 7. Without measurements, classification cannot be completed here. Final answer: Measure each triangle's angles and sides, then classify using the above rules.