The diagram shows a lawn with a fence along one edge 12m 17m 20m one can of weedkiller can cover 100 square metre each can cost
£19.75
work out the total cost of cans of weedkiller needed to cober the lawn you must show some working
work out the total cost of cans of weedkiller needed to cober the lawn you must show some working
1 answer:
Answer:
59.25 euros
Step-by-step explanation:
The figure that is formed is the following with the respective measurements, now to calculate the area we need the height, for Pythagoras we have:
17 ^ 2 = h ^ 2 + 8 ^ 2
h ^ 2 = 289 - 64
h ^ 2 = 225
h = 15
now the figure area is as follows:
A = h * (b + a) / 2
b long side 20 m and short side 12 cm, replacing:
A = 15 * (12 + 20) / 2
A = 240 m ^ 2
We are told that each can of weedkiller can cover up to 100m ^ 2
Thus:
240/100 = 2.4, so you would need 3 cans of weedkiller
each can costs 19.75, which means that the total cost is:
19.75 * 3 = 59.25 euros
You might be interested in
B. The total area painted is 864; they must buy two cans of paint.
Step-by-step explanation:
Step 1:
A rectangle's area can be calculated by multiplying its length and its width. The wall is made up of 5 different types of rectangular walls. All walls are 8 feet tall but the length varies.
Step 2:
The area of the 20 feet long wall =
The area of the 10 feet long wall =
The area of the 5 feet long wall =
The area of the 4 feet long wall =
The area of the 15 feet long wall =
The area of all the walls = 432 square feet.
Since there are two sides for every wall, total area = square feet.
Step 3:
If one paint can covers 500 square feet,
the number of cans required to paint 864 square feet = cans.
so 2 paint cans are needed to paint 864 square feet which is option B.