The 3rd square number and 9th square number added together

Base Area = 77cm squared

Step-by-step explanation:

Volume = height x base area

Since we have the volume and height, we can solve for base area using thei formula (we can use ba for base area). Although since we are finding the area of base in square cm we will need to convert litres into cubic cm:

1 Litre = 1000 cubic cm

1.54 x 1000 = 1540 cubic cm

1540 = 20 x ba

1540/20=bax20/20

ba = 77cm squared

Hope this helped!