how do i measure square footage for a triangle?
955408
the formula is half the height times the base.  But here's why:\n\nFirst consider a rectangle.  You know the surface to be height times width.  Now cut the rectangle in two pieces, along a diagonal.  You end up with two triangles. Furthermore, the sides of these triangles are the same, thus the triangles themselves are equal. The surface of each has to be half that of the surface of the rectangle.\n\nFor triangles with a right angle in them, you have proven 0.5*h*b to be correct.  But each triangle will work.  If you have a triangle without a right angle, you can always find a way to split it in two smaller triangles, each having a right angle, and process each part separately.\n\nYou could also cut a parallelogram in two equal parts (again: cut a diagonal) and end up with two equal triangles, not having a right angle.
47718
So you've got an eight-sided figure and each side is 72-feet.  If you draw horizontal and vertical lines from each vertex (the angles where sides meet) to the other side of the octagon, you'll see that the octagon can be split up into one large square (in the center), four rectangles (up, down, left and right), and four triangles (in the corners).  You following me?  Get out a pencil and get to it!  Okay.  So what are lengths of your square's sides?  You'll note that the square has 72-foot sides, just like the original octagon.  Since you know how to find the area of the square, you're on your way.\n\nNext.  you have four rectangles, each with a length of 72-feet, but the short end - the width, how do we figure out the width of the rectangle?  Okay.  Look at your triangles.  Each triangle has one side of 72 feet - the side which is the outside of the octagon - and then two equal sides - it's an isosceles triangle with a 90-degree angle.\n\nOkay, time to call on pythagoras.  Pythagorean theorem states that a^2 + b^2 = c^2.  What that means is this: If you take the length of sides a and b (the ones we don't know) and square them, and add them together, the answer will be 72-squared (side C).  Too bad I'm not there with you to make this part easier to understand.  We know that a and b are equal in this case because our triangle is isosceles.  Therefore, 2x^2 is equal to 72^2.  This gives us a messy equation wherein our answer is, x is ROUGHLY equal to 51 feet.\n\nSo.  You have a square with sides 72 feet long.  You have 4 rectangles each with length 72 and width 51.  You have 4 triangles each with base 51 feet and height 72 feet.  You know that squares and rectangles have an area equal to length times width, and triangles have an area equal to one-half base times height.\n\nCalculate the area for your 9 figures and add them together.  THAT will be the square footage of your octagon.\n\nWhat... did you think I was going to do it ALL for you?
778088
Perimeter means the total length or distance around the sides of the triangle, so if you add all three measurements you get D - 18 inches.
23271
The area of a triangle can be found by multiplying the base times the one-half the height.\n\nIf a triangle has a base of length 6 inches and a height of 4 inches, its area is 6*2=12 square inches
240184
You can draw a triangle with base of 6 and height of 8.\n\nAs the area of a triangle is one-half*base*height, as long as the product of your base and height is 48 units, use those dimensions for your triangle. For example, you could draw a right triangle with base of 6, height of 8, and hypotenuse of 10, but it doesn't *have* to be a right triangle. You can also draw an isoceles triangle with base of 6 and height of 8 - make your base, start your height line at the "3" mark, and then form the rest of the triangle by dropping two segments from the top of the "height" segment to each end of the "base" segment.
389991
height times the base area. divided by three.
833189
Area = 5 square meters\nBase = 2x\nArea of any triangle = (Base*Height)/2\n5 = (2x*Height)/2\n5 = x*Height (The 2's cancel each other out)\nx*Height = 5\nHeight = 5/x(Divide both sides by 'x')\n\nI hope that helped
168445
first find a vicinity plan. \nget a straw(in sodas) and a triangle\nstand on a specific location with the distance of X from the building.\nmake sure to know your height.\ncreate a transit by putting the straw along the hypoteneous of your 45x45 triangle.\nlook through the straw (try to see the zenith of the building) and measure the angle of depression.\nthen, simply apply the law of sines and cosines etc etc.\nthis will not give you exact building height but an instant approximation. this can also be used in finding approximate height of towers, canyons, mountains, and volcanoes.
471423
The area of the rectangle is:\n A of rectangle = L X W = 12 x 8 = 96 sq in\n\nThe area of the triangle is:\nA of triangle = 1/2 (A)(B) = 1/2 (A)(32 in) where A is the altitude to the base B of the triangle.\n\nsince both areas are equal:\n96 sq. in = 1/2(A)(32 in)\n96 sq. in = A (16 in)\nA = (96 sq. in)/16 in\nA = 6 inches
204855
Looks to me like you are trying to figure out a "PERIMETER" rather than an "AREA".  If so, you need to ADD the lengths of all the sides together.  If you ARE looking for an area, it is simply Length x Width (for a rectangle or square), 1/2 the base x height (for a triangle), or Pi x radius squared (Pi is approximately =3.1415926) for a circle.  If the "shape" of the object you are trying to find the area of is irregular, then you must divide it up into these familiar shapes first, find EACH individual area, then add those areas together for the total area.
666057
*\n1/2 base X altitude + area (triangle)\n\n\n45 square centimeters
436114
well, you could be an architect and be using a 30-60-90 triangle and you needed to know a particular side of it. you can use x times the square root of 3, x being the shorter leg, to find the length of the longer leg.
619584
Do you mean inside area of triangle ?\n\nArea= 1/2 (base)(height)
876778
The triangle is a right triangle of sides 3,4,5.\nThe maximum rectangle occurs when a perpendicular is raised from the midpoint of the short side to the hypotenuse (side that equals 5) and then a perpendicular from point  to the side   that is of length 4. The dimensions of this rectangle are 2* 1.5 = 3 square units.
721808
If you are trying to make a triangle out of three equal lengths, all you do is devide 180 by 3.....and taddaaa you get your angles.\n\nIf does not matter how long each side is.
279842
You need to measure the outside walls, not the square footage. Vinyl siding is measured in running feet, not square feet. Measure the length of each of your outside walls, than measure the height of the walls, and include the gabels if your putting siding there, this is very important, especially if you have a split level home. Take these measurements with you to the Home Depot, Sears wherever your buying the siding.
277948
as the first answer said divide it into triangles then find the area of each triangle using K(area)=(1/2)ab sin C, that is two sides of the triangle and the angle in between.  Then you simply add together the different triangles.  This is assuming the polygon is regular and every side is of equal length otherwise alot of other trig must be done to find the angle and distances.