E and F are points on the sides PQ and PR respectively of a `trianglePQR`.For each of the following cases, state whether `EF||QR`:(iii)PQ =.1.28 cm, PR = 2.56 cm, PE = 0.18 cm and PF = 0.36 cm

E and F are points on the sides PQ and PR respectively of a trianglePQR .For each of the following cases, state whether EF||QR :(ii) PE = 4 cm, QE =4.5 cm, PF = 8 cm and RF = 9 cm

E and F are points on the sides PQ and PR respectively of a trianglePQR .For each of the following cases, state whether EF||QR :(i)PE = 3.9 cm,EQ = 3 cm,PF= 3.6 cm and FR = 2.4 cm

D and E are two points on the sides AC and AB respectively of triangleABC such that triangle ADE~triangleABC .If AD=1.9cm,AE=3.6cm.BE=2.1cm.and BC=8.4 cm.find DE.

In triangle ABC D and E are respectively two points on the side AB and AC.AB=12 cm,AD=8 cm,AE=12 cm and AC=18 cm then show that DE|\|BC .

angleQ of trianglePQR is a right angle.If PQ=4 cm,QR=3cm,then find the length of the median drawn from Q to PR.

X is point on PQ and Y is a point on PR of a ∆PQR such that XY||QR . If (PQ)/(XQ)=7/3 and PR = 6.3 cm , find YR

In Fig 12,PS is a diameter of a circle whose radius is 6 cm.Two points Q and R are taken on PS such that PQ=QR=RS.Two semicircles are drawn with PQ and QS as their respective diameters as shown in the figure.Find the perimeter and the area of the shaded region shown in figure. (pi=3.14)

ABC is a triangle. D and E are two points on AB and AC respectively such that DE is parallel to BC and AD=1 cm , BD= 2cm . What is the ratio of the area of /_\ABC to the area /_\ADE .

With a certain cell, the balance point is obtained at 65 cm from the end of apotentiometer wire. With another cell whose emf differs from that of the first by 0.1V the balance point is obtained at 60cm. Find the emf of each cell.