What type of triangle is shown in the image?

Analysis of the Image:

The image displays a question from what appears to be a quiz or test. The question is in Russian and asks about a specific type of triangle. The triangle shown has a right angle symbol, indicating it is a right-angled triangle. Additionally, the tick marks on two of the sides indicate that these two sides are of equal length, making it an isosceles triangle. Therefore, the triangle is a right-angled isosceles triangle.

Options presented:

• равносторонний (equilateral)
• прямоугольный равносторонний (right-angled equilateral)
• прямоугольный равнобедренный (right-angled isosceles)
• равнобедренный (isosceles)

Based on the visual cues in the image, the correct answer is 'прямоугольный равнобедренный'.