Final answer:
The area of the house with a 10m x 20m base is 200 square meters.
Step-by-step explanation:
To find the area of a house with a 10m x 20m base, you can multiply the length by the width. In this case, the area would be 10m x 20m = 200 square meters. Therefore, the correct answer is option 2) 200 sqm.