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Difficulty: 2/102023 NMTC 2023 (QII-23)

Consider triangle ABC with ∠B = 30° and ∠C = 60°. What is the type of ΔABC?

Guide / Hint

Hint 1: Use the angle sum property of triangles to find the measure of .

Hint 2: Subtract the sum of and from .

Hint 3: A triangle with one angle is classified as a right triangle.

Solution

Step 1 (Find the Third Angle): The sum of the interior angles of a triangle is always :

Step 2 (Direct Calculation): We are given and :

Step 3 (Classify Triangle): A triangle containing one angle of exactly is defined as a right-angled triangle.

Step 4 (Conclusion): The type of is a right triangle.

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    2023 NMTC 2023 QII-23 - Olympiad Math Olympiad Question | Leminno