Cho tam giác ABC vuông tại A , đường cao AH. Gọi D là điểm đối xứng với H qua AB , gọi E là điểm đối xứng với H qua AC . a) Chứng minh rằng D đối xứng với E qua A
b) Tam giác DHE là tam giác gì ? Vì sao
c) Chứng minh BC = BD + CE

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English version :

Let ABC be a right triangle at A, altitude AH. Let D be the point of symmetry with H through AB , let E be the point of symmetry with H through AC .
a) Prove that D is symmetric about E through A
b) What is the triangle DHE? Why
c) Prove BC = BD + CE

ddsf

step-by-step explanation:

dfs

ummm seems that u didnt post the attachement !

step-by-step explanation:

we can use this expression to calculate the energy gain as a particle moves with a field or the energy loss as it moves against it. (note that it is also used to define the electron-volt, a unit of energy equal to that gained by an electron as it falls through a pd of 1 v, i.e. w = 1 ev = 1.6 10-19 c 1 v = 1.6 10-19j).in fact this expression is really nothing more than the statement that potential is the potential energy per unit charge. in this case, v= w/qis simply stating that the change in potential energy(or work done) per unit charge is equal to the change in potential (or potential difference), v.student questions: uniform electric fields2electron beamcathode+5 kvanode0 v