If the base triangle's two sides 'a' and 'b' and the included angle 'θ' are given, then its area is found using the formula 1/2 ab sin θ square units.The formula is also known as Heron's formula. The same formula can be applied for an isosceles triangle or an equilateral triangle. If the type of base triangle is scalene, where all three sides 'a', 'b', and 'c' are given, then its area is calculated using √ square units.If the base triangle is an isosceles triangle with its sides to be 'a', 'a', and 'b' then its area is (b/4) × √(4a 2 - b 2 ) square units.
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