Geometry

Question Analysis:
This question requires classifying a triangle based on angle measures.
The main focus is recognizing the 30°-60°-90° special right triangle.

Key Concept Explanation:
A right triangle has one 90° angle.
A 30°-60°-90° triangle is a special right triangle with specific side ratios.

Step-by-Step Solution:
Identify the given angles: 30°, 60°, and 90°.
Since there is a 90° angle, the triangle is a right triangle.
Checking the answer choices:
(A) Acute Triangle: Incorrect, because an acute triangle has all angles < 90°.
(B) Right Triangle: Correct, because it has a 90° angle.
(C) Equilateral Triangle: Incorrect, because equilateral triangles have three 60° angles.
(D) Isosceles Triangle: Incorrect, because an isosceles trian...