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Matched Pairs involves participants being selected for one group only but part of each group are matched for some relevant factors eg) age, gender, height. Kiecolt Glaser did a matched pairs experiment in 1995.
four, well two pairs of angles (they're matched
Prob(two sets of matched birthdays) = 1 - [Prob(No matched birthdays)] + [Prob(One set of matched birthdays)] = 0.63
Two pairs of congruent angles and one pair of congruent sides ( sides not between the pairs of angles ).
If they are not matched pairs, it does not really matter. If the combined sample size is fixed (because of costs, say) then it is better to have a larger sample where more variability is expected.