What is the area of the triangle whose sides are 9cm, 10cm

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Using Rule 2 and 3,
Semi-perimeter,

S =	9 + 10 + 11	= 15 cm
	2

Area of triangle
= √s(s - a)(s - b)(s - c)
= √15(15 - 9)(15 - 10)(15 - 11)
= √15 × 6 × 5 × 4 = 30√2 cm²