Two triangles are congruent if they meet they both meet the rules for congruency
The rules that makes the given triangles congruency are;
a) SSS
(b) SAS
(c) ASA
(d) Not congruent
(e) AAS
(f) HL
Reasons:
(a) Segment QS ≅ Segment QR; Same number of tic marks indicating congruency
Segment SP ≅ Segment PR; Same number of tic marks indicating congruency
Segment QP ≅ Segment QP; Reflexive property
Therefore;
- ΔPQS ≅ ΔPQR by Side-Side-Side, SSS, rule of congruency
(b) Segments AC, BC, on ΔABC ≅ Segments CD, CE, on ΔCDE Given
m∠DCE ≅ m∠ACB; Vertically opposite angles postulate
Therefore;
- ΔABC ≅ ΔDEC by Side-Angle-Side SAS, rule of congruency
(c) Segment ST ≅ Segment TU; Given
m∠RST = m∠VUT = 90°; Given
∠VTU = ∠RTS; By vertical angle theorem
Therefore;
- ΔRTS ≅ ΔUTV by Angle-Side-Angle, ASA, rule of congruency
(d) Not congruent because given parameter Side Side Angle not a condition for congruency
Not congruent
(e) ∠GHJ ≅ ∠GFJ; Given
∠HJG ≅ ∠JGF; Given
Segment GJ ≅ Segment GJ; By reflexive property
Therefore;
- ΔGFJ ≅ ΔGJH; By Angle-Angle-Side, AAS similarity rule
(f) Hypotenuse AB ≅ Hypotenuse DE; Given
Leg AC ≅ Leg DF; Given
Therefore;
- ΔABC ≅ ΔDFE; by Hypotenuse Leg, HL, rule of congruency
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