Nazima is fly fishing in a stream. The trip of her fishing rod is 1.8m above the surface of the water and the fly at the end of the string rests on the water 3.6m away and 2.4 m from a point directly under the trip of the rod. Assuming that her string (from the trip of the rod to the fly) is that, how much string does she have out (see the figure)? If she pills in the string at the rate of 5 cm per second, what will be the horizontal distance of the fly from her after 12 seconds?
CBSE Class 10 Triangles — Complete Guide
Triangles carries the highest marks in Geometry (8-10 marks). BPT proof and Pythagoras theorem proof are must-prepare topics.
Quick Revision: Key Concepts
- BPT: If DE ∥ BC, then AD/DB = AE/EC
- Similarity criteria: AA, SSS, SAS
- Area ratio: ar(▵1)/ar(▵2) = (side ratio)²
- Pythagoras: hypotenuse² = base² + perpendicular²
Most Important Questions
- Prove BPT (Thales' theorem) — 5 marks guaranteed
- Prove Pythagoras theorem using similarity
- Prove triangles are similar using AA/SSS/SAS and find unknown sides
- Area ratio problems
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