HW 4.1 PAP key-1
Triangle Congruence Statements
Congruence Problems
Complete the congruence statements based on given pairs:
LC III ?BK
KJ III ?CM
LK III ?LC
LM III ?L.J HY
ACML III ?AKJB
AKBJ III ?CCLM
List Congruent Sides and Angles
Find four pairs of congruent sides:
Pair 1: [Specify pairs based on the triangle]
Pair 2:
Pair 3:
Pair 4:
Find four pairs of congruent angles:
Angle 1: [Specify angles based on the triangle]
Angle 2:
Angle 3:
Angle 4:
Questions on Triangle Congruence
For Exercises 19 and 20, conclude if the triangles are congruent and justify:
ATRK and ATUK: YES
Reason: All corresponding sides are equal (must specify which sides).
ASPQ and ATUV: NO
Reason: Only one segment corresponds between triangles.
Proving Congruence with the Given Properties
Definitions and Proof Statements
Given: AB || DC, angles LBAC and LDCA are supplementary.
Proof Steps
Statement: AB || DC
Reason: Given.
Angles: LBAC and LDCA are alternative interior angles.
Reason: Definition of alternate interior angles.
Properties: LBAC || LDCA, confirming angle relationships.
Reason: Alternate Interior Angles Theorem.
Segment Equality: BC III AD
Reason: Given relationships define congruence.
Conclude: AABC III ACDA
Reason: Definition of Congruent Triangles.
Connect Mathematical Ideas
Angle Measurements and Line Segments
Find measures and lengths using provided equations:
If mLA = x + 10, mLD = 2x:
Solve: mLA = 20, mLB = 12.
Given m/B = 3y and mLE = 6y - 12:
Determine values: y = 4.
For sides BC = 3z + 2, EF = z + 6, find equivalency:
z = 2, BC = 8, EF = 8.
Compare AC = 7a + 5 with DF = 5a + 9:
Solve: a = 2, AC = 19, DF = 19.
If ADEF III ALMN, consider correct congruence statements:
Options:
A: DE III LN
B: FE III NL
C: LN = FF
D: LM = FF
Variable Values Calculation
Solve for variables in equations:
For 3x = 45, find:
x = 15.
For 6x = 30, solve:
x = 5.
Given equations: 2t = 4,
Solve for t: t = 2.
Further Proofs and Theorems
Given the relationships among lines and angles:
Objective: Prove APRS III AQTS with alternate interior angles.
Step 1: Identify properties of bisected angles and segments.
Step 2: Use graphical interpretations of segments involving equal parts and angles for proving congruence using alternate interior angles theorem.