The title of the first volume of mathematics in the sixth grade of primary school

1. The diameter of the bottom of the largest cylinder is 8 cm, and the height of the cylinder is 50 cm.

So the surface area of this cylinder is the circumference of the bottom × height+area of the bottom × 2 = π× 8× 50+π× (8 ÷ 2)? ×2=432π= 1356.48 (square centimeter)

2. The difference between finding the surface area of a cylinder and the above question is that the area of the bottom surface is missing.

π×6×2× 15+π×6? = 180π+36π= 2 16π= 678.24 cm2

The reserved integer is 678 square centimeters.

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