it will be helpful to remember the following:

we can say 2 triangles are similar if two angles of one triangle are equal to two angles of another triangle.

Having said that,

triangle pqr and qsr(or qsp) are similar

reason:

ang pqr = 90 = ang qsr

ang prq = ang qrs (they represent the same angle in the figure)

now because of that since corresponding sides are proportional,

qs/4 = 3/5

so qs = 12/5

-anish

saurya_s wrote:

Twixt, can you plz explain the concept mate?