Geometry

Question Analysis:
This question requires classifying a triangle based on both side lengths and angles.
The main focus is recognizing an equilateral triangle and confirming whether it is acute, right, or obtuse.

Key Concept Explanation:
Equilateral Triangle: Has all three sides equal and all angles = 60°.
Isosceles Triangle: Has at least two equal sides (so all equilateral triangles are also isosceles).
Scalene Triangle: Has no equal sides.
Acute Triangle: Has all angles < 90°.
Right Triangle: Has one 90° angle.
Obtuse Triangle: Has one angle > 90°.

Step-by-Step Solution:
Side Length Classification:
An equilateral triangle has all three equal sides, making it equilateral.
Since all equilateral triangles have at least two equal sides, it is also isosceles.
Angle Classification:
The given angles are 60°, 60°, and 60°.
Since all angles are less than 90°, it is an acute triangle.

Checking the answer choices:
(A) Equilateral Triangle ✅ Correct, because all three sides are equal.
(B) Isosceles Triangle ✅ Correct, because it has at least two equal sides.
(C) Scalene Triangle ❌ Incorrect, because all sides are equal.
(D) Acute Triangle ✅ Correct, becau...