Math Problem Statement

resolver:

En la figura siguiente, m∠ABD = 104°, m∠EBD = 33°, y BE biseca ∠CBD. Hallar m∠ABC.

Solution

To solve the problem, we need to find the measure of ABC\angle ABC.

Given:

  • mABD=104m \angle ABD = 104^\circ
  • mEBD=33m \angle EBD = 33^\circ
  • BE\overline{BE} bisects CBD\angle CBD

Step-by-Step Solution:

  1. Interpretation of bisector property: Since BE\overline{BE} bisects CBD\angle CBD, the measure of CBE\angle CBE is equal to the measure of EBD\angle EBD. Therefore: mCBE=mEBD=33m \angle CBE = m \angle EBD = 33^\circ

  2. Relationship between the angles:

    • The full angle ABD\angle ABD is made up of ABC\angle ABC and CBD\angle CBD.
    • CBD\angle CBD consists of two equal parts: CBE\angle CBE and EBD\angle EBD.

    Therefore, we can write: mABD=mABC+mCBE+mEBDm \angle ABD = m \angle ABC + m \angle CBE + m \angle EBD

  3. Substitute the known values: 104=mABC+33+33104^\circ = m \angle ABC + 33^\circ + 33^\circ

  4. Solve for mABCm \angle ABC: 104=mABC+66104^\circ = m \angle ABC + 66^\circ mABC=10466=38m \angle ABC = 104^\circ - 66^\circ = 38^\circ

Thus, the measure of ABC\angle ABC is 38\boxed{38^\circ}.


Would you like more details or explanations on this problem? Here are some related questions to explore:

  1. How do you calculate angles when a bisector is involved in different geometric setups?
  2. What is the general formula for finding unknown angles in a triangle?
  3. How does the Angle Addition Postulate apply to complex angle problems like this?
  4. Can we use the Law of Cosines for non-right triangles to verify angle measures?
  5. How do bisectors affect the properties of triangles in geometry?

Tip: Always break down geometric figures into smaller, simpler parts when working with bisectors and angle sums.

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Math Problem Analysis

Mathematical Concepts

Geometry
Angle Bisectors
Angle Addition

Formulas

m∠ABD = m∠ABC + m∠CBE + m∠EBD
If BE bisects ∠CBD, then m∠CBE = m∠EBD

Theorems

Angle Bisector Theorem
Angle Addition Postulate

Suitable Grade Level

Grades 8-10