If you add 5cm to one side of a triangle, the area of the triangle will increase 15cm. The height of this side of the triangle is ()

15 × 2 △ 5 = 6cm

If the bottom of a triangle is increased by 5cm, the area of the triangle will be increased by 15cm. The height of the bottom of the triangle is () cm

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15 × 2 △ 5 = 6cm
Its height is six centimeters
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The area of a triangle is 18 square centimeters, its bottom is 12 centimeters, how many centimeters is its height?

A: the height of this triangle is 3cm

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