Second grade math!

1. The area of the graph and the square is the square of 2πCM. Which of them has a bigger circumference? What can you get from it?

It should be round.

But the circumference of a square is longer.

What we get from it is that when the areas of regular polygons are equal, the more sides, the smaller the circumference and the smallest the circumference of a circle.

2. When the weather is clear, the farthest distance a person can see the sea can be calculated by the square of the formula S = 16.88h (unit: m), that is, the height of eyes from the sea level. If a person stands on the shore and observes, the height of his eyes from the sea level is 1.5M, how far can he see? If you board an observation deck, how far can you see when your eyes are at an altitude of 35 meters?

Substitute h= 1.5m, and s 2 =16.88×1.5 = 25.32.

Substitute h=35, S 2 = 16.88× 35 = 590.8.