Question

第18题为什么现在b？

Answer 1

IT SAYS THAT EA IS THE PERPENDICULAR BISECTOR OF ZT, SO ANGLE AZT=ANGLE EAT=90, ZA=AT, SO ANSWER C CAN BE PROVED

IN TRIANGLE EAZ AND TRIANGLE EAT, THERE ARE 

ANGLE AZT=ANGLE EAT=90, ZA=AT,AE=AE

TRIANGLE EAZ IS CONGRENT TO TRIANGLE EAT (SAS)

ANGLE ZEA IS CONGRUENT TO ANGLE AET, ANGLE Z IS CONGRUENT TO ANGLE T, SO ANSWER A AND D CAN BE PROVED

FOR THE ANSWER B, IT SAYS TRIANGLE EZT IS EQUILATERAL, IT'S NOT REAL, IT IS ISOSECLES TRIANGLE.

WE CAN PROVE ZE=ET, BUT WE CANNOT PROVE ZE=ZT

SO WE CAN ONLY CHOOSE ANSWER B.

Answer 2

B的意思是这是一个等边三角形，当然不正确

Answer 3

显然从题目给的已知条件"EA垂直等分ZT“只能说明EZT是等腰三角形，无法证明的EZT是等边三角形，因此选B