Cho tam giác ABC vuông tại a đường cao AH a) Cho AB=6,AC=8.Tính BC ,AH ,BH

b) Lấy K thuộc AC, kẻ AD vuông góc với BK .Chứng minh Tam giác BHK đồng dạng với Tam giác BDC

c) chứng minh BD²/AB²=BH . DC /HK .BK

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According to the 2008 u. s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?