Math Problem Statement

In the given figure AB || CD, ∠A = 128°, ∠E = 144°. Then, ∠FCD is equal to?

Solution

Problem Breakdown:

We are given the following:

  1. ABCDAB \parallel CD (parallel lines)
  2. A=128\angle A = 128^\circ
  3. E=144\angle E = 144^\circ
  4. The task is to find FCD\angle FCD.

Solution:

Since ABCDAB \parallel CD, the properties of parallel lines and their transversals will be used.

Step 1: Analyze the diagram

  • The given diagram shows a transversal EFEF cutting ABAB and CDCD.
  • The angle E=144\angle E = 144^\circ is an exterior angle, while A=128\angle A = 128^\circ is an interior angle at the top.

Step 2: Relationship of angles

  • Using the property of parallel lines, the sum of the interior angle on the same side of the transversal is 180180^\circ.
    Thus,
    A+FCE=180\angle A + \angle FCE = 180^\circ
    Substituting A=128\angle A = 128^\circ,
    128+FCE=180128^\circ + \angle FCE = 180^\circ
    FCE=52\angle FCE = 52^\circ

Step 3: Find FCD\angle FCD

  • The total straight angle at point CC is 180180^\circ, and it is divided into two angles: FCE\angle FCE and FCD\angle FCD.
    Thus,
    FCD=180FCE\angle FCD = 180^\circ - \angle FCE
    Substituting FCE=52\angle FCE = 52^\circ,
    FCD=18052=128\angle FCD = 180^\circ - 52^\circ = 128^\circ

Final Answer:

The value of FCD\angle FCD is 128\mathbf{128^\circ}.

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Math Problem Analysis

Mathematical Concepts

Parallel Lines and Transversals
Angle Relationships
Linear Pair

Formulas

Sum of angles on the same side of the transversal = 180°
Linear pair angles sum = 180°

Theorems

Properties of Parallel Lines
Linear Pair Theorem

Suitable Grade Level

Grades 8-10