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LL Congruence theorem says: If the two legs of one right triangle are congruent to the two legs of another right triangle, then the two right triangles are congruent.
LA Congruence Theorem says: If one leg and an acute angle of one right triangle are congruent to one leg and an acute angle of another right triangle, then the two right triangles are congruent.
Similarity is where triangles have equal angles at each corner. Congruence is where triangles have sides of equal length.
Pascal (both the Persians and the Chinese) discovered the congruence of traingle during the eleventh century
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