Calculate Parallelogram Area: Using 3cm Base and 6cm External Height

To solve this problem, we proceed with the following steps:

• Step 1: Identify the base of the parallelogram as $AD = 3 \, \text{cm}$.
• Step 2: Identify the external height as $BE = 6 \, \text{cm}$.
• Step 3: Use the area formula for the parallelogram: $\text{Area} = \text{Base} \times \text{Height}$
• Step 4: Substitute the given measurements into the formula: $\text{Area} = 3 \, \text{cm} \times 6 \, \text{cm}$
• Step 5: Compute the area: $\text{Area} = 18 \, \text{cm}^2$

Therefore, the area of the parallelogram is $18 \, \text{cm}^2$, which matches the given answer choice.

The correct answer is choice 2: 18 cm².