Answer: The correct choices are D and F.
Step-by-step explanation:
There are two classifications of triangles shown.
Any triangle can only be two.
The first classification depends on the triangles' angles:
- Acute triangles are triangles with three angles under 90 degrees.
- Right triangles are triangles with a right angle.
- Obtuse triangles are triangles with an obtuse angle.
The second classification depends on the triangles' sides:
- Equilateral triangles are triangles with three equal side lengths.
- Isosceles triangles are triangles with two equal side lengths.
- Scalene triangles are triangles with no equal side lengths.
The triangle given has angles of 36, 54, and 90 degrees. 90 degrees is a right angle, so the triangle is a right triangle.
The triangle given has side lengths of 7, 5.1, and 8.66. No side lengths are equal, so the triangle is a scalene triangle.
The correct choices are D and F.
