The area \( A \) of a triangle can be calculated using the formula:
\[ A = \frac{1}{2} \times \text{base} \times \text{height} \]
We know the area \( A \) is 28 cm² and the height is 4 cm. We can rearrange the formula to solve for the base:
\[ A = \frac{1}{2} \times \text{base} \times \text{height} \] \[ 28 = \frac{1}{2} \times \text{base} \times 4 \]
First, simplify the right side:
\[ 28 = 2 \times \text{base} \]
Now, divide both sides by 2:
\[ \text{base} = \frac{28}{2} = 14 \text{ cm} \]
So, the base of the triangle is 14 cm.
Response: 14cm
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