I have a lot of hobbies,but my favorite hobby is play boad games. I started play boad games when i was 8 years old.I often play boad games with my family and my friends.We play boad games on saturday .Play boad games help me relax after a busy week with lot of homework.I think play boad games is very fun and interesting.I love play boad games.

I have a lot of hobbies,but my favorite hobby is play boad games. I started play boad games when i was 8 years old.I often play boad games with my family and my friends.We play boad games on saturday .Play boad games help me relax after a busy week with lot of homework.I think play boad games is very fun and interesting.I love play boad games.

I have a lot of hobbies,but my favorite hobby is play boad games. I started play boad games when i was 8 years old.I often play boad games with my family and my friends.We play boad games on saturday .Play boad games help me relax after a busy week with lot of homework.I think play boad games is very fun and interesting.I love play boad games.

I have a lot of hobbies,but my favorite hobby is play boad games. I started play boad games when i was 8 years old.I often play boad games with my family and my friends.We play boad games on saturday .Play boad games help me relax after a busy week with lot of homework.I think play boad games is very fun and interesting.I love play boad games.

I have a lot of hobbies,but my favorite hobby is play boad games. I started play boad games when i was 8 years old.I often play boad games with my family and my friends.We play boad games on saturday .Play boad games help me relax after a busy week with lot of homework.I think play boad games is very fun and interesting.I love play boad games.

I have a lot of hobbies,but my favorite hobby is play boad games. I started play boad games when i was 8 years old.I often play boad games with my family and my friends.We play boad games on saturday .Play boad games help me relax after a busy week with lot of homework.I think play boad games is very fun and interesting.I love play boad games.

I have a lot of hobbies,but my favorite hobby is play boad games. I started play boad games when i was 8 years old.I often play boad games with my family and my friends.We play boad games on saturday .Play boad games help me relax after a busy week with lot of homework.I think play boad games is very fun and interesting.I love play boad games.

I have a lot of hobbies,but my favorite hobby is play boad games. I started play boad games when i was 8 years old.I often play boad games with my family and my friends.We play boad games on saturday .Play boad games help me relax after a busy week with lot of homework.I think play boad games is very fun and interesting.I love play boad games.

I have a lot of hobbies,but my favorite hobby is play boad games. I started play boad games when i was 8 years old.I often play boad games with my family and my friends.We play boad games on saturday .Play boad games help me relax after a busy week with lot of homework.I think play boad games is very fun and interesting.I love play boad games.

a)xét Δ ABC và Δ ADC có:

AB=AD(GT)

góc BAC=góc DAC(=90 độ)

AC là chung

nên ΔABC= ΔADC(c.g.c)

Do đó BC=DC nên ΔCBD cân tại C

b)xét ΔBCM và ΔEDM có ;

góc BCM=góc EDM( 2 góc so le trong)

CM=DM( M là trung điểm của CD )

góc BMC = góc EDM(2 góc đối đỉnh)

nên ΔBCM= ΔEDM(g.c.g)

suy ra BC=DE