4. Find the area of the triangle whose sides are (i) 26 cm, 28 cm, 30 cm (ii) 48 cm, 73 cm, 55 cm (iii) 21 cm, 20 cm, 13 cm (iv) 7.5 cm, 18 cm, 19.5 cm
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area of triangle (1)336cm² (2)1320cm² (3)126cm² (4)67.5cm².
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