A square has a side length of 50 cm. Four right triangles with legs of 40 cm and 30 cm are placed along the four corners of the square, as shown below.
What is the area of the region inside the square not covered by the four triangles?
A right trapezoid is partitioned into 4 triangles by its diagonals, as shown:
Which colored region has a largest area?
The 2 diagonals of this rectangle divide it into 4 triangles.
If the area of the shaded region is 42, then what is the area of the rectangle?
A rectangle is divided by four lines, as shown, with 4 of the resulting triangles having known areas. Find the area of the quadrilateral that is shaded in grey.
7 non-overlapping unit circles are inscribed inside a large circle as shown below. Find the area of the shaded region?