There is a square orchard covering an area of 1 hectare. If its sides are extended by 200 meters, how many hectares will the area of the orchard increase?

There is a square orchard covering an area of 1 hectare. If its sides are extended by 200 meters, how many hectares will the area of the orchard increase?

1 hectare = 10000 square meters, the side length of the original square is 100 meters (100 + 200) × (100 + 200) - 10000 = 90000-10000 = 80000 (square meters) 80000 square meters = 8 hectares. A: the area of the orchard will be increased by 8 hectares

A rectangular wheat field is 500 meters long and 400 meters wide, with 120 tons of wheat. How many tons of wheat are produced per hectare?

500 × 400 = 200000 square meters = 20 hectares, 120 ／ 20 = 6 tons; a: the average yield of wheat is 6 tons per hectare

A trapezoidal wheat field, 300 meters at the top, 500 meters at the bottom and 100 meters high. How many hectares is its area? If 7000 kg wheat is harvested per hectare, can this wheat field yield 30 tons of wheat?

(300 + 500) × 100 △ 2 = 800 × 50 = 40000 (square meter) = 4 (hectare) 4 × 7000 = 28000 (kilogram) = 28 (ton) 28 tons < 30 tons, so we can't harvest 30 tons of wheat. Answer: this wheat field can't harvest 30 tons of wheat