Problem 356. Square, Point inside, Triangles, Area
Level: High School, College, SAT Prep.
The figure shows a square ABCD of area
S. A point P is inside the square. If S1, S2,
S3, and S4, are the areas of triangles
PAB, PBC, PCD, and PAD, respectively, prove that S1 +
S3 = S2
+ S4 = S/2.
Geometry problem solving
Geometry problem solving is one of the most challenging skills for students to learn. When a problem requires auxiliary construction, the difficulty of the problem increases drastically, perhaps because deciding which construction to make is an ill-structured problem. By “construction,” we mean adding geometric figures (points, lines, planes) to a problem figure that wasn’t mentioned as "given."