Area of a triangle with three given numeric sides (Heron's formula)

1. A.
   30 cm$^2$
2. B.
   35 cm$^2$
3. C.
   40 cm$^2$
4. D.
   42 cm$^2$

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1. A.
   300 square cm
2. B.
   305 square cm
3. C.
   306 square cm
4. D.
   307 square cm

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1. A.
   $14.9$ cm$^2$
2. B.
   $14.7$ cm$^2$
3. C.
   $14.5$ cm$^2$
4. D.
   $14.3$ cm$^2$

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1. A.
   $3\sqrt{7}$ square unit
2. B.
   8 square unit
3. C.
   7 square unit
4. D.
   $7\sqrt{3}$ square unit

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