Without knowing where a, b and h are, we have no way of knowing whether ab and ah are lengths, widths or diagonals and consequently, no way of determining the area.
I don't know how to sum geometrical figures. I suppose you could count it: one! One trapezoid! Ah ah ah ah ah. The sum of the interior angles of any convex four-sided polygon is 360 degrees. The some of the exterior angles of any convex polygon (no matter how many sides it has) is 360 degrees.
Half the sum of the parallel sides, times the height between them, that is how you calculate the area of a trapezium.And that is what we learnt at school (to the tune of pop goes the weasel.)______________Here's some more detail, for those who want it:For a trapezoid where h is the height (ie: the distance between the two parallel sides), and a & b are the lengths of the two parallel sides:Area = h (a + b) / 2Proof:If you look at a trapezoid sitting on the longer of its two parallel sides, you will see that it's actually a rectangle in the middle, with a right-angled triangle on each side.The area of the rectangle would be:h x a (where a is the shorter parallel side)For the two right-angled triangles, if c and d are the lengths of the perpendicular sides, then the areas are:(h * c) / 2 and(h * d) / 2So, we add the two triangle areas together, and cancel:(h * c + h * d) / 2= h (c + d) / 2This can be substituted for the following, since in a trapezoid a + c + d = b, hence c + d = b - ah (b - a) /2So, the total area of the trapezoid is the sum of the two formulas:h (b - a) / 2 + h * a(multiply the "h * a" part by 2, and divide be 2 as well, to get a common denominator):= h (b - a) / 2 + 2ha / 2= h (b - a + 2a) / 2= h (b + a) / 2So, there's your proof. A little complicated, but hopefully you get the idea.
b = Ah divide both sides by A b/A = h
yes it is
Without knowing where a, b and h are, we have no way of knowing whether ab and ah are lengths, widths or diagonals and consequently, no way of determining the area.
The country code and area code of Anqing- AH, China is 86, (0)556.
The country code and area code of Bengbu- AH, China is 86, (0)552.
The country code and area code of Chaohu- AH, China is 86, (0)565.
The country code and area code of Chizhou- AH, China is 86, (0)566.
The country code and area code of Fuyang- AH, China is 86, (0)558.
The country code and area code of Hefei- AH, China is 86, (0)551.
The country code and area code of Huaibei- AH, China is 86, (0)561.
The country code and area code of Huainan- AH, China is 86, (0)554.
The country code and area code of Huangshan- AH, China is 86, (0)559.
The country code and area code of LiuAn- AH, China is 86, (0)564.
The country code and area code of MaAnshan- AH, China is 86, (0)555.