Cho tam giác ABC có diện tích 60cm2 . Trên BC lấy điểm M sao cho BM=CM.
Nối A với M. Trên AM lấy điểm D sao cho AD=DM. Nối B với D, C với D.
i) Liệt kê tất cả các tam giác có trong hình vẽ. Trong các tam giác trên, những tam giác nào
có diện tích bằng nhau. Vì sao?
ii) Kéo dài BD cắt AC tại E. Tính diện tích tam giác ABE

4

step-by-step explanation:

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.

the number of the people going.

step-by-step explanation:

the cost to buy one movie ticket is $7. if the total cost for the movie is a function of how many people go, then the input is : the number of the people going.