Rhombus: area = half product of diagonals, side from half-diagonals

1. A.
   $\frac{xy}{2}$
2. B.
   $\frac{xy}{4}$
3. C.
   $xy$
4. D.
   $x^2 - y^2$

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1. A.
   48 square units
2. B.
   36 square units
3. C.
   24 square units
4. D.
   12 square units

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1. A.
   200 cm
2. B.
   120 cm
3. C.
   100 cm
4. D.
   90 cm

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1. A.
   150 square metre
2. B.
   225 square metre
3. C.
   300 square metre
4. D.
   450 square metre

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1. A.
   160 cm
2. B.
   164 cm
3. C.
   168 cm
4. D.
   172 cm

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