$A$ triangle whose sides measure ............ is a right-angled triangle.

  • A
    $6, 8, 12$
  • B
    $7, 24, 25$
  • C
    $7, 15, 17$
  • D
    $3, 7, 9$

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In $\Delta ABC,$ the midpoints of the sides are $P, Q, R.$ In $\Delta PQR,$ the midpoints of the sides are $X, Y, Z.$ If the area of $\Delta XYZ$ is $20,$ find the area of $\Delta PQR$ and $\Delta ABC.$

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