The school has a rectangular flower bed, 8 meters long. When the campus is built, the length of the flower bed is reduced by 3 meters, so the area of the flower bed is reduced by 18 square meters

The school has a rectangular flower bed, 8 meters long. When the campus is built, the length of the flower bed is reduced by 3 meters, so the area of the flower bed is reduced by 18 square meters

Width 18 △ 3 = 6M
The original perimeter is (8 + 6) × 2 = 28m
The current perimeter is (8-3 + 6) × 2 = 22 meters

The area of an isosceles triangle is 30 square meters, with one side 10 meters long and the other two sides 10 meters long

If the bottom edge is 10 meters, then x = 5, y = 6, the other two sides are equal, and the waist length is √ (25 + 36) = √ 613) if the waist length is 10 meters, then x ^ 2 + y ^ 2 = 10 ^ 2, then x = √ 10

There is an isosceles triangle grassland with an area of 30 square meters in a residential area. One side of the grassland is 10 meters long. If we want to fence the grassland, its length is 10 meters___

1. The waist length is √ 61
The perimeter is 2 √ 61 + 10
2. 10 for waist,
(1) When it is an acute triangle
Waist high 6, using Pythagorean theorem desire
The bottom edge is 2 √ 10
The perimeter is 2 √ 10 + 20
(2) For obtuse triangle
The bottom is 6 √ 10
The perimeter is 20 + 6 √ 10
To sum up, the perimeter is 2 √ 61 + 10
or
2√10+20
or
20+6√10