Geometry

Question Analysis:
This question requires calculating the third angle of a triangle to determine if it is acute, right, or obtuse.
The main focus is on using the Triangle Sum Theorem.

Key Concept Explanation:
The Triangle Sum Theorem states that the sum of all angles in a triangle is 180°.
A Right Triangle has one 90° angle.
An Obtuse Triangle has one angle greater than 90°.
An Acute Triangle has all angles less than 90°.

Step-by-Step Solution:
Calculate the third angle: 180° − (35° + 75°) = 180° − 110° = 70°
Classify the triangle:
The three angles are 35°, 75°, and 70°.
Since all angles are less than 90°, this is an Acute Triangle.

Option Analysis:
A (Incorrect): A right triangle must have one 90° angle, but this one does not.
B (Incorrect): An obtuse triangle must have one angle > 90°, but all angles here are less than 90°.
C (Correct): Since all three angles are less than 90°, this is an Acut...