A rectangular land, length increased by 4 meters, area increased by 80 square meters; width increased by 4 meters, area increased by 200 square meters?

A rectangular land, length increased by 4 meters, area increased by 80 square meters; width increased by 4 meters, area increased by 200 square meters?

If the length is increased by 4 meters, the increased area is 4 times the width is equal to 80, then the original width is 80 / 4 = 20 meters
If the width is increased by 4 meters, the increased area is 4 times the length is 200, then the original length is 200 / 4 = 50 meters,
Original area 20 * 50 = 1000 square meters

The scale of the figure below is 1:200, the length is 3cm and the width is 2cm
It's a triangle

Actual length: 3 △ 1 / 200 = 600 (CM) = 6M
Width: 2 △ 1 / 200 = 400 (CM) = 4m
Actual area:
6 × 4 = 24 (M2)

I require the area of a circle: 2622 in length and 210 in diameter. How can I calculate its square area!

Area = square of π R
=3.14X105X105
=34618.5