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The pythagoras theorem is very important. it is somehow related to the RHS rule of congruency. some criterias are: 1. ASA CRITERIA 2.SSS CRITERIA 3. SAS CRITERIA 4. RHS CRITERIA A STANDS FOR ANGLE S STANDS FOR SIDE R STANDS FOR RIGHT ANGLE H STANDS FOR HYPOTENUSE( THE LONGEST SIDE OF A RIGHT ANGLE)

HOPE IT HELPS PLZ MARK AS BRAINLIEST
and all the best for ur exam do well!:)

It would have been a lot more convenient if you would have mentioned the class you are studying in,..... however, some theorems are always important, like- 1.pythagoras theorem ( + = ) 2.heron's formula (area of triangle=, where s is the semi perimeter) 3.area of equilateral triangle with side a, = 4. height of equilateral triangle with side a= 5. the congruence criterion (SSS, ASA, SAS, RHS) 6.the similarity criterion (AA,SSS, ASA) 7. mid-point theorem (the line joining the mid points of any two sides of an triangle is parallel and half to the third side) 8.Thale's theorem (if a line parallel to a side of a triangle intersects the other two sides at distinct points, it divides both of them in the same ratio) 9.the angle opposite to the longer side is larger. these are the basics.... please mark as the brainliest