Which is the longest side in the triangle PQR, right-angled at P? *
1. PQ
2. QP
3. PR
4. QR
5. PR
6. QR
chose the correct one
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A lump of cotton wool has a lot of air trapped inside the space present in its fibers. When this lump of cotton is immersed in water, all the air is replaced by water. Due to this, the cotton lump shrinks down
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