Lecture one, from the beginning
JR Tutorials · YouTube
Similar versus congruent, and the proportionality theorems, built up from the start.
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Chapter 1 of Geometry, SSC Std 10 (English Medium). A short revision read — free, no sign-up.
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Practice Set 1.1 solved
Yogesh Sir's Backbenchers · YouTube
The first practice set worked sum by sum.
Problem Set 1, complete
Galaxy of Maths · YouTube
The full end-of-chapter problem set, which is where the harder proofs appear.