Area of a Triangle

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What’s the area of this triangle? 7cm 1cm
Area = 3.5 cm$^2$
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What’s the area of this triangle? 77cm 8cm
Area = 308 cm$^2$
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What’s the area of this triangle? 36cm 15cm
Area = 270 cm$^2$
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What’s the area of this triangle? 55cm 86cm
Area = 2365 cm$^2$
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What’s the area of this triangle? 9cm 42cm
Area = 189 cm$^2$
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What’s the area of this triangle? 31cm 4cm
Area = 62 cm$^2$
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