Question

which triangle has 0 reflectional symmetries?

Explanation:

A triangle with \(0\) reflectional symmetries is a scalene triangle (no equal sides or angles). The first triangle (right - angled with all sides of different lengths as indicated by the different markings) is scalene. The second triangle is isosceles (two equal sides, so has \(1\) reflectional symmetry). The third triangle is also a right - angled triangle but with two sides equal (if we assume the markings for equal sides).

Answer:

The first triangle (the top - most triangle in the given image) has \(0\) reflectional symmetries.