# Area of a Quadrilateral within a Triangle

Area of a Quadrilateral within a Triangle

Let be a triangle and let and be points on and , respectively. Let . You can calculate the area of the triangle by checking "coordinates" to find the base and height. You can drag the points and . Suppose that and that .

ΔABC

E

F

BC

AC

D=AE⋂BF

|ΔABC|

B

C

|ΔADF|/|ΔABD|=3/7

|ΔADF|/|ΔBDE|=3/7

What is ? See Details for the solution.

|ECFD|/|ΔABC|