To buy a tablecloth for her dining table, which is 2.5m by 1.2m on its top surface, Mrs Joe also considered leaving 30cm hanging down from all around the table surface. If Mrs Joe put the cloth flat on the ground, what was the perimater of the cloth in centimetres?
2.5 m = 2500 cm
1.2 m = 1200 cm
2500 + 60 = 2,560 cm
1200 + 60 = 1,260 cm
P = 2L + 2W
Can you take it from here?
2(2.5+2*.3 + 1.2+2*.3) = 9.8m
or, the original perimeter plus two sides of each of the the four 30cm squares on the corners:
2(2.5+1.2) + 4(2*0.3) = 9.8
To find the perimeter of the cloth, we need to add up the lengths of all four sides.
First, let's calculate the length and width of the tablecloth. Mrs Joe wants the cloth to hang down 30cm on all sides, so we need to add 30cm to both the length and width of the table's top surface.
The length of the tablecloth would be:
Length of table's top surface + Hanging down on one side + Hanging down on the other side
= 2.5m + 0.3m + 0.3m
= 3.1m
The width of the tablecloth would be:
Width of table's top surface + Hanging down on one side + Hanging down on the other side
= 1.2m + 0.3m + 0.3m
= 1.8m
Now we need to convert the length and width of the tablecloth from meters to centimeters, since we want the perimeter in centimeters.
The length of the tablecloth in centimeters would be:
3.1m * 100cm/m = 310cm
The width of the tablecloth in centimeters would be:
1.8m * 100cm/m = 180cm
Finally, we can calculate the perimeter of the tablecloth:
Perimeter = 2 * (Length + Width)
Perimeter = 2 * (310cm + 180cm)
Perimeter = 2 * 490cm
Perimeter = 980cm
Therefore, the perimeter of the cloth, when laid flat on the ground, is 980 centimeters.