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those windows are cleaned everyday.
some flowers are being watered by the workers at the moment
the thieves are being followed by the police into a buliding now
My car has been repaired by the mechanic
the news are told by the neighbors
the pigeons are fed by the woman everyday
John was pịcked in his office
the house is showed
some bread are being eaten in the kitchen at the moment
the walls are being painted at the present
TL:
Tính được A 3 ^ = A 1 ^ = B 3 ^ = B 1 ^ = 60 ° A 2 ^ = A 4 ^ = B 2 ^ = B 4 ^ = 120 °
^HT^
đừng k câu dưới nhe
TL
Tính được A3 ^ = A1 ^ = B3 ^ = B1 ^ = 60 ° A2 ^ = A4 ^ = B2 ^ = B4 ^ = 120 °
Hoktot~
ΔACD và ΔBCD có :
AC = BC (gt)
CD chung
AD = BD (gt)
⇒ ΔACD = ΔBCD (c.c.c)
⇒ góc A = góc B = 120o (hai góc tương ứng)