How to calculate the base area of a triangle?

The base area of a triangle, because the triangle is a plane figure and has no base area. Understanding that the bottom of the three-dimensional figure is a triangle is the formula for calculating the area of the triangle.

Calculation formula of triangle area:

1, given the triangle base a and height h, then S = ah/2.

2. Given three sides A, B and C of a triangle, then (Helen formula) (p=(a+b+c)/2)

s =√[p(p-a)(p-b)(p-c)]=( 1/4)√[(a+b+c)(a+b-c)(a+c-b)(b+c-a)]

3. Given the two sides A and B of a triangle and the included angle C between the two sides, then S = 1/2 * ABS Inc.

4. Let the three sides of a triangle be A, B and C respectively, and the radius of the inscribed circle be R..

Then the triangle area =(a+b+c)r/2.

5. Let the three sides of a triangle be A, B and C respectively, and the radius of the circumscribed circle be R..

Triangle area =abc/4R.

Extended data:

Solution of base area of cuboid and cube

1, the bottom area of a cuboid = length × width.

2. The bottom area of the cube = side length × side length

Volume calculation related to bottom area

1, the volume of cuboids and cubes is equal to the bottom area multiplied by the height.

2. If V represents the volume of a cylinder, S represents the bottom area and H represents the height, then V=SH.

3. the square area s = the square of a (a is the side length), and the volume of a cube v = the cube of a.

4. The bottom area of the cylinder is S = σ r 2 (R is the radius of the bottom surface) and the volume is V=Sh(S is the bottom area).

5. The formula of the bottom area of a cone is the same as that of a cylinder, and the volume is V= 1/3*Sh(h is the height).