Bài 1. Cho ∆ABC vuông tại A, kẻ đường cao AH. Biết AB = 4cm, AC = 7,5cm. Tính HB, HC. Bài 2. Cho ∆ABC vuông tại A, kẻ đường cao AH. Biết AB = 6cm, BH = 3cm. Tính AH, AC, CH.
Bài 3. Cho ∆ABC vuông tại A, kẻ đường cao AH. Tính diện tích ∆ABC biết AH = 12cm, BH = 9cm.
Bài 4. Cho ∆ABC biết BC = 7.5cm, AC = 4.5cm, AB = 6cm.
a) ∆ABC là tam giác gì? Tính đường cao AH của ∆ABC.
b) Tính độ dài các cạnh BH, HC.

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

The school track has eight lanes. each lane is 1.25 meters wide. the arc at each end of the track is 180. the distance of the home straight and the radii for the arcs in the 1st 4 lanes are given. s=85m r1=36.5m r2=37.75m r3=39m r4=40.25m part one: find the radii of lanes 5 through 8 of the track. show your work. part two: if max ran around lane one, how far did he run? show your work and explain your solution. part three: max wants to run a total of three laps around the track, choose two additional lanes (2-8) for him to run and find the distance around those two lanes. show your work and round to the hundredths. part 4: based on your lane choices in part three, what was the total distance max ran in the three laps around the track?

:)i need to know on which ones are corresponding, alternate interior, alternate exterior, or none of these.