Math Problem Statement

Треугольник ABC вписан в окружность с центром O. Угол BCA равен 82°. Найдите угол BOA. Ответ дайте в градусах.

Solution

This problem involves a triangle ABCABC inscribed in a circle, with OO being the center of the circle. The given angle is BCA=82\angle BCA = 82^\circ, and we are tasked with finding the central angle BOA\angle BOA.

Step-by-Step Solution:

  1. Key property of inscribed and central angles:
    For any arc of a circle, the central angle is twice the inscribed angle subtending the same arc.
    In this case, BOA\angle BOA subtends the same arc as BCA\angle BCA.

  2. Relation between BOA\angle BOA and BCA\angle BCA:
    BOA=2BCA\angle BOA = 2 \cdot \angle BCA

  3. Substitute the given value of BCA=82\angle BCA = 82^\circ:
    BOA=282=164\angle BOA = 2 \cdot 82^\circ = 164^\circ

Final Answer:

BOA=164\boxed{\angle BOA = 164^\circ}

Would you like a deeper explanation of this property or other examples?


Follow-up Questions:

  1. What is the relation between central and inscribed angles in a circle?
  2. How does the concept of subtended arcs apply to angles in circles?
  3. What happens if BCA\angle BCA were obtuse or acute?
  4. Could you calculate BOA\angle BOA if the angle at the center were given first?
  5. What other problems involve triangles inscribed in circles?

Tip:

Remember that central angles are always twice the inscribed angles subtending the same arc! This rule is fundamental for solving problems involving circles and angles.

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Math Problem Analysis

Mathematical Concepts

Geometry
Circles
Inscribed Angles
Central Angles

Formulas

Central Angle = 2 × Inscribed Angle

Theorems

Theorem on Central and Inscribed Angles of a Circle

Suitable Grade Level

Grades 9-11