No they're not wrong. You have correctly calculated that one of the interior angles is 135 degrees. You can then halve it, which gives you the angle PAB and then the angles PAB and EAB are supplementary - thy add to 180 degrees as they're on a straight line.
Either method will work, I personally just find summing up the angles to 360 more straight forward. If a is the interior angle of the hexagon and b is the interior angle of the octagon, then it makes sense that 360=a+b+x as they make up the circle centered around that vertex.
Either method will work, I personally just find summing up the angles to 360 more straight forward. If a is the interior angle of the hexagon and b is the interior angle of the octagon, then it makes sense that 360=a+b+x as they make up the circle centered around that vertex.
Simple. Work out the overall area; which is simple the whole rectangle and I'm sure you know how to work that out; let's call this area A.
Next work out the area of the patio which is again just finding the area of the rectangle; lets call this area P.
Now to work out the area of the two ponds, remember that the area of a circle is πr2 and the radius is half the diameter (you can use π=3.14 if you're calculator doesn't have it). Once you have the area of one pond, multiply it by 2 because there are two ponds which should give you the total area that the 2 ponds take; call this area R.
Now the area of the grass, G, it would be G=A-P-R (Total area take away the patio and take away the two ponds)
Once you have the grass area, you can work out how many boxes are needed.
Simple. Work out the overall area; which is simple the whole rectangle and I'm sure you know how to work that out; let's call this area A.
Next work out the area of the patio which is again just finding the area of the rectangle; lets call this area P.
Now to work out the area of the two ponds, remember that the area of a circle is πr2 and the radius is half the diameter (you can use π=3.14 if you're calculator doesn't have it). Once you have the area of one pond, multiply it by 2 because there are two ponds which should give you the total area that the 2 ponds take; call this area R.
Now the area of the grass, G, it would be G=A-P-R (Total area take away the patio and take away the two ponds)
Once you have the grass area, you can work out how many boxes are needed.
So I work out area of grass and patio separately and add it up to find the sum of the whole area?
You get the area of the grass differently than others. When you do 17x9.5 you are finding the whole area, which includes the patio, the grass and the 2 ponds. You don't want the ponds and the patio so you take their areas away which only leaves the area of the grass.
You get the area of the grass differently than others. When you do 17x9.5 you are finding the whole area, which includes the patio, the grass and the 2 ponds. You don't want the ponds and the patio so you take their areas away which only leaves the area of the grass.