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7:39 AM
Thursday, June 26, 2008
8:45 PM
Saturday, June 14, 2008
Ratio
-For two similar plane figures,if the ratio of their corresponding sides is a : b, then the ratio of their areas is a : b.
-For two similar solids, if the ratio of their corresponding sides is a : b, then the ratio of their volumes is a : b.
8:45 PM
Similarity
-Two triangles are similar of
>each pair og corresponding angles are equal, and
>each pair of corressponding sides are proportional
-If each of the three pairs of corresponding angles of two triangles are equal, then the two triangles are similar. this is also known as the Angle-Angle-Angle similarity test.
-If the three pairs of corresponding sides of two triangles are in equal proportions, hten the two sides are similar. this is also known as the Side-Side-Side similarity test.
-If two pairs of corresponding sides of two triangless are in equal proportions and their included angles are equal, then the two triangles are similar. this test is also known as the Side-Angle-Side similarity test.
8:25 PM
Congruency
-When two triangles are congruent,each pair of corresponding angles and each pair of corresponding sides are equal.(Abbreviation: corr. part of )
-If three pairs of corresponding sides of two triangles are equal, then the two triangles are congruent.This is also known as the Side-Side-Side test.(Abbreviation:SSS)
-If two sides and the included angle of one triangle are equal to the corresponding parts of another triangle, then the two triangles are congruent. This is also known as the Side-Angle-Side test.(Abbreviation: SAS)
-If two angles and the included side of one triangle are equal to the corresponding parts of another triangle, then the two triangles are congruent.This is also known as the Angle-Side-Angle test.(Abbreviation:ASA)
-If the hypotenuse and one sie of a right angled triangle are equal to the corresponding parts of another right angled triangle, then both triangles are congruent.This is also known as the Right Angle-Hypotenuse-Side test.(Abbreviation:RHS)
