The diagonals of a rhombus bisect each other perpendicularly, making the
angles formed by the intersecting diagonals to be 90°.
Correct Response:
Given:
The quadrilateral represented by ABCD = A rhombus
Required:
To prove that ∠1 = ∠2
Solution:
From the diagram, we have;
The measure of ∠AOD = ∠1, the measure of ∠AOB = ∠2
The two column proof is presented as follows;
Statement [tex]{}[/tex] Reasons
1. ABCD is a rhombus [tex]{}[/tex] 1. Given
2. AB = BC = CD = DA [tex]{}[/tex] 2. Definition
3. AO = OC, BO = OD[tex]{}[/tex] 3. Diagonals of a rhombus bisect each other
4. ΔAOD ≅ ΔAOB [tex]{}[/tex] 4. SSS congruency postulate
5. ∠1 ≅ ∠2 [tex]{}[/tex] 5. CPCTC
6. ∠1 = ∠2 [tex]{}[/tex] 6. Definition of congruency
SSS (Side-Side-Side) congruency postulate states that if the three sides of
one triangle are congruent to the three sides of another triangle, the two
triangles are congruent.
CPCTC is an acronym for Corresponding Parts of Congruent Triangles are Congruent.
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Answer:
1. Given.
2. Definition.
3. Diagonals of a rhombus bisect each other.
4. SSS congruency postulate.
5. CPCTC.
6. Definition of congruency.