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a) xét 2 tam giác , ta có :
\(\stackrel\frown{E}\) = \(\stackrel\frown{D}\)= 90
=> tam giác vuông
\(\stackrel\frown{A}\) chung
AB=AC
=> 2 tam giác bằng nhau(g-c-g)
b, xét 2 tam giác ABH và ACH
AB=AC
AH chung
góc B = góc C
=> 2 tam giác bằng nhau
=> đpcm
c) Áp dụng định nghĩa của trọng tâm tam giác => AH > HC
Dịch
This is the way to my home. From the gate of Sai Gon Junior High School, turn left. You go straight until you see a village gate named: Phuc Duc village, you turn into it. You go straight until the turn, you go to the left. You go straight one step and then another to another. Instead of going straight, turn left. Go until you see a gate named: Happy New Year, you do not turn to that continue to go. Go about 10 meters longer then you will see a small open. Please go into that lane. The carpentry home is my home.
đây nha:This is the way to my home. From the gate of Sai Gon Junior High School, turn left. You go straight until you see a village gate named: Phuc Duc village, you turn into it. You go straight until the turn, you go to the left. You go straight one step and then another to another. Instead of going straight, turn left. Go until you see a gate named: Happy New Year, you do not turn to that continue to go. Go about 10 meters longer then you will see a small open. Please go into that lane. The carpentry home is my home.
dễ vậy mà bạn ko bt lm ạ