What is SSS,SAS,AAA,ASA,AAS???

First, we need to understand what is 'S' and 'A'.
S = side, A= angle

To prove the triangles are congruent, we use SSS, SAS, ASA, AAS, RHS

SSS = side side side :
3 sides are equal, we can prove they are congruent triangle.

SAS = side, angle, side :
2 sides and 1 included angle are equal, we can prove they are congruent triangle.

ASA = angle, side, angle :
2 angles and 1 included side are equal, we can prove they are congruent triangle.

AAS = angle, angle, side :
2 angle and 1 non-included side are equal, we can prove they are congruent triangle.

RHS = right-angle, hypotenuse(直角三角形的斜邊), side :
1 right angle, 1 hypotenuse, 1 side are equal,we can prove they are congruent triangle.

AAA is used to prove the triangles are similar.
AAA : angle, angle, angle
3 angles are equal,we can prove they are similar triangle.

Hope I can help you.

It is used to prove whether the triangles are congrence.

ＳＳＳ　三對應邊

ＳＡＳ　兩邊一夾角

ＡＳＡ　一邊兩鄰角

ＲＨＳ　直角斜、鄰邊

ＡＡＳ　兩角一鄰邊

SSS是線線線
SAS是線角線
AAA是角角角
ASA是角線角
AAS是角角線

These are all congruency tests for triangles.S=sideA=angleR=right angleH=hypotenuse

這些都是求證兩個相似三角形的方法

S = Side (邊)
A = Angle (角)


SSS = 三條邊相等
SAS = 邊,角,邊相等 (以順時針方向計)
AAA = 三隻角相等
ASA = 角,邊,角相等
AAS = 角,角,邊相等

而 RHS 比較特別些, 時一隻直角(R)加一條斜邊(H)及一條鄰邊(S).

一般求證兩個三角形是否相同,只要指出三個共同點就可以了.