Discussion

Explanation:

Using pythagorus theorem,

372 = 122 + (3rd side)2  

⇒ (3rd side)2 = 1369 - 144 = 1225

⇒ 3rd side = 35

∴ Area of triangle = 1/2 × 12 × 35 = 210 cm2

Hence, option (c).

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