Question

choose all the obtuse triangles.

Explanation:

Step1: Recall the definition of an obtuse triangle

An obtuse triangle has one angle greater than \(90^{\circ}\).

Step2: Analyze each triangle

• For the left - most red triangle: By visual inspection (or using angle - measuring tools if available in a real - world scenario), it has an angle greater than \(90^{\circ}\).
• For the middle red triangle: It appears to be an acute triangle (all angles less than \(90^{\circ}\)).
• For the top - right green triangle: It appears to be an acute triangle.
• For the bottom - left green triangle: It has an angle greater than \(90^{\circ}\).
• For the bottom - middle green triangle: It appears to be an acute triangle.
• For the bottom - right red triangle: It appears to be an acute triangle.

Answer:

The left - most red triangle, the green triangle at the bottom - left.