A screwdriver is 20 centimeters long and a piece of wire is 10 millimeters long. The screwdriver is how many times as long as the wire? What is the right 20, 10, 2, 1/2.

the two may have that, even a breakdown is probably offered

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 answer is  

d.

21

i did this one. so you should get it right.