Rst is an equilateral triangle; . if rx = 3, then rt =

RT =3 units

Step-by-step explanation:

 Here given in the question one side of a triangle is 3 units. We know that all sides in any equilateral triangle must be  

Hence , we say that from this property of equilateral triangle . The side RT in  triangle RST  =3 unit.

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.