
Given: In ΔPQR, S and T are points on sides PR and QR
To Prove: ΔRPQ ~ ΔRTS
Proof: In ∆RPQ and ∆RST,
\(\angle\)RTS = \(\angle\)QPS (Given)
\(\angle\)R = \(\angle\)R (Common angle)
∴ ∆RPQ ∼ ∆RTS (By AA similarity criterion)
Hence Proved
Fill in the blanks using the correct word given in the brackets :
(i) All circles are __________. (congruent, similar)
(ii) All squares are __________. (similar, congruent)
(iii) All __________ triangles are similar. (isosceles, equilateral)
(iv) Two polygons of the same number of sides are similar, if (a) their corresponding angles are __________ and (b) their corresponding sides are __________. (equal, proportional)



| Case No. | Lens | Focal Length | Object Distance |
|---|---|---|---|
| 1 | \(A\) | 50 cm | 25 cm |
| 2 | B | 20 cm | 60 cm |
| 3 | C | 15 cm | 30 cm |