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:
- (parallel lines)
- The task is to find .
Solution:
Since , the properties of parallel lines and their transversals will be used.
Step 1: Analyze the diagram
- The given diagram shows a transversal cutting and .
- The angle is an exterior angle, while 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 .
Thus,
Substituting ,
Step 3: Find
- The total straight angle at point is , and it is divided into two angles: and .
Thus,
Substituting ,
Final Answer:
The value of is .
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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
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