Answer:
The rectangle field is 400 meters long and 300 meters wide. What is the area in square kilometers?
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First we have to know how many meters goes on one kilometer. We can see by the prefix “kilo-” that it goes 1000 meters on a kilometer. Therefore:
1km=1000m
Secondly the area of a rectangle is defined as the product of the width and the height:
A=w∗h
We can now approach the problem in two ways, we convert the sides of the rectangle to kilometers first or we convert the area from square meters to square kilometers.
Convert sides:
Let w = width, h = height and A = area
w=300m=300/1000m=0.3km
h=400m=400/1000m=0.4km
A=0.3∗0.4km2=0.12km2
Convert area:
Lets first calculate the area in square meters:
Am=300∗400=120000m2
We know from above that 1km=1000m
That gives 1km2=1000∗1000m2=1000000m2
So Ak=Am/1000000=0.12km2
Answer:
0.14 km square
Step-by-step explanation:
Area = Length * Breadth (In rectangle)
=> So, as we have to find it in square kilometers, we can either first convert to km and then find the area, or first find the area and then convert.
Method 1: First convert : (Easier)
When we convert 400 meters to kilometers, we get,
1 meter = 0.001 kilometers
So, 400 meters = 0.4kilometers
And, 350 meters = 0.35 kilometers
Area = 0.4 * 0.35 = 0.14 square kilometers
Method 2 : First find :
400 meters * 350 meters = 140000 meters square
Note : Meters square = Square meters
=> 1 km square = 1000000 meters square
So, 140000/1000000
=> 0.14
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