Question

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​

Answer 1

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