Bài 1: Một con thuyền đi với vận tốc 6km/h vượt qua một khúc sông nước chảy mạnh mất 6 phút. Biết rằng đường đi của con thuyền tạo với bờ một góc 65°(Như hình vẽ
bên).
Tính chiều rộng khúc sông ? (làm tròn đến mét).

the least common denominator is 40

the volume is the product of the area of the base, 3x(3x+4), and the height, 3x-1

step-by-step explanation:

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.

the correct answer option is d. la = πrs.

step-by-step explanation:

we know that for a right cone, the lateral surface area is given by:

lateral area of right cone =

here the value under the square root is equal to slant height so replacing this value by in the formula to get:

lateral area of right cone =

therefore, the correct answer option is d.