Xiao Ming's family has a rectangular dining table, 25 decimeters long and 12 decimeters wide. How much table cloth do you want? If you want to sew lace around the table cloth, how long will the lace be

Xiao Ming's family has a rectangular dining table, 25 decimeters long and 12 decimeters wide. How much table cloth do you want? If you want to sew lace around the table cloth, how long will the lace be

Area = 25 × 12 = 300 square decimeters
Lace = 2 × (25 + 12) = 74 decimeters

Sewing lace for this square tablecloth shared 30 meters and 2 decimeters. How many decimeters is the side length of this square tablecloth at least?

asd2274217,
Lace length:
30 m 2 decim = 302 decim
The side length is:
302 △ 4 = 75.5 (m)
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I suspect that you wrongly typed 3.2 decimeters as 30.2 decimeters. If so, the answer is:
Lace length:
3M, 2DM = 32dm
The side length is:
32 △ 4 = 8 (m)

A square tablecloth is sewn with 300 cm lace. What's the area of this tablecloth? The math problem is coming soon! OK, bonus points
A square tablecloth is sewn with 300 cm lace around it. What's the area of this tablecloth? The school playground is 200 meters long. It takes two minutes for a student to do morning exercise and run around the playground at the speed of 300 meters per minute. What's the area of the playground? It's a rectangle, twice as long as it's wide. It's known that the perimeter is 60 meters. What's the area?

(300 / 4) * (300 / 4) = 0.525 M2
Width = (300 * 2-200 * 2) / 2 = 100m, area = 100 * 200 = 20000 m2
Let width be a, then length be 2a, perimeter L = (a + 2a) * 2 = 6A = 60, a = 10, area s = a * 2A = 200 square meters