15:41 (watch on YouTube, opens in a new tab)Don't Underestimate Similar Triangles! (watch on YouTube, opens in a new tab)
Similar triangles are easy to underestimate, but spotting them can make a tricky geometry question much simpler. Four problems involving circles, common tangents, parallel lines and area ratios: how to spot the useful pair of triangles, match the corresponding sides and use their ratios to find a way through.
- Similar triangles
- Circle geometry
- Tangents
- Area ratios
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