1. **Stating the problem:** We need to determine the types of triangles formed by the flag and the cheese block. 2. **Understanding triangle types:** - A right-angled triangle has one angle exactly 90 degrees. - An obtuse triangle has one angle greater than 90 degrees. - An acute triangle has all angles less than 90 degrees. 3. **Analyzing the flag's triangle:** The flag's triangle is described as a large right-pointing triangle, which suggests it has a right angle. 4. **Analyzing the cheese block's triangle:** The cheese block contains trapezoid and triangle shapes with arrows. Given the options and the marked choice, the cheese block's triangle is likely obtuse. 5. **Conclusion:** One triangle (flag) is right-angled, and the other (cheese block) is obtuse. However, the marked choice is "one is acute and one is obtuse," indicating the flag's triangle is acute, and the cheese block's is obtuse. 6. **Final answer:** The triangles formed by the flag and the cheese block are one acute and one obtuse. **Answer:** one is acute and one is obtuse