area of pentagon formula

Set Ω to M edge shape (for example), vertices are arranged along the boundary forward, and the coordinates are Create a polygon area vector graph of Ω. A triangle is formed by two vertices adjacent to a polygon, and the area of the triangle is obtained by the outer product of two plane vectors composed of three vertices. Area

for the number of points, I is any one point, X and Y are horizontal ordinate, ∑ is the sum. For example, the coordinates of the three vertices of a triangle in a planar Cartesian coordinate system are (a, b), (C,d), (e,f), then the area of the triangle is:0.5a (d-f) +0.5c (f-b) +0.5e ( b-d)You can also change the formula X to Y,y for x, the same reason.From: http://ete1314.blog.163.com/blog/static/16256113

DoubleD =Dist (C1,C2); - if(R1 + R2 return 0; About if(D EPS) $ { - DoubleR =min (r1,r2); - returnpi*r*R; - } A Doublex = (d*d + r1*r1-r2*r2)/(2*d); + DoubleT1 = ACOs (x/R1); the DoubleT2 = ACOs ((d-x)/r2); - returnR1*R1*T1 + r2*r2*t2-d*r1*sin (t1); $ } the the intMain () { the intT; Point C1, C2; the Doubleans, R, R, X1, y1, x2, y2; -scanf"%d", T); in for(intCAS =1; CAS CAs) { thescanf"%LF%LF%LF%LF%LF%LF", r, r, x1, y1, AMP;X2,

To find the area of the triangle /* Syntax: result = AREA3 (float x1, float y1, float x2, float y2, float x3, float y3); Parameters: x1~3: Triangle 3 vertices x coordinate y1~3: Triangle 3 vertex y-coordinate return value: Triangle area/// * method: Helen-Qin Jiu formula known triangle A,b,c, then S area =√[p (P- A) (P

Polygon Area Calculation Formula Function polygonArea (points) {var I, j; var area = 0; for (I = 0; I Polygon Area Formula description: We all know the three-point area formula of

Reference: http://iask.sina.com.cn/ B /9499520.html What is the formula for calculating the perimeter and area of a triangle, rectangle, square, trapezoid, or circle? Perimeter: girth area: Area 1. Triangle (General triangle, Helen formula) Triangle Perimeter L = A + B

DescribeImplements a C + + Triangle class that contains 3 points (CPoint type) and completes the area.The code in the main function is given, please fill it out, and do not include the code that you have given when committing.int main () {CPoint P1, p2, P3;while (cin>>p1>>p2>>p3) {Ctriangle T (P1, p2, p3); coutInputThe input data has multiple groups, each group contains x1, y1, x2, y2, x3, y3 six integers, representing three points (x1, y1), (x2, y2), (x3, Y3), three points not collinear.OutputE