Step 1: Understanding Transparent Colours.
Transparent colours allow light to pass through, revealing the underlying surface. Watercolour is a transparent medium, meaning it can be applied in thin washes, allowing the texture and features of the paper to show through.
Step 2: Verifying the Options.
- Option (1): Watercolour is the most transparent colour medium.
- Option (2): Oil colours are typically opaque and not transparent.
- Option (3): Poster colours are generally opaque and not transparent.
- Option (4): Pastels can be applied thickly and are generally not transparent.
Conclusion:
Therefore, the correct answer is (1) Water colour.
$PQ$ is a chord of length $4\ \text{cm}$ of a circle of radius $2.5\ \text{cm}$. The tangents at $P$ and $Q$ intersect at a point $T$. Find the length of $TP$.