Answer:
B. Scalene
D. Obtuse
Step-by-step explanation:
B. Scalene: By definition, a scalene triangle is a triangle with no equal sides and have internal angles with different measures.
D. Obtuse: By definition, an obtuse triangle is a triangle in which one of the interior angles is greater than 90°. Since one of the interior angles is greater than 90° (specifically, one of the angles is 120°), then the triangle matches the definition of an obtuse triangle.
The given triangle is NOT:
- It is not an acute triangle because by definition, an acute-angled triangle is a type of triangle in which all the three internal angles of the triangle are less than 90°.
- It is also not an isoceles triangle because by definition, an isosceles triangle is a triangle with two sides of equal length (and two angles of equal measure).
- It is not an equilateral triangle because by definition, equilateral triangles have three sides of equal length, and have three internal angles that measure 60°.
- It is not a right triangle because by definition, a right triangle is a triangle in which one angle is a right angle.
