The British Flag Theorem deals with sums of squares of distances from an interior point in this figure. Cutting a square off the "golden" variety of this figure yields another "golden" one, and gluing two opposite edges of this figure after giving it a half-twist yields a (*) Mobius strip. This figure's diagonal has length 
The British Flag Theorem deals with sums of squares of distances from an interior point in this figure. Cutting a square off the "golden" variety of this figure yields another "golden" one, and gluing two opposite edges of this figure after giving it a half-twist yields a (*) Mobius strip. This figure's diagonal has length equal to the square root of the sum of the squares of its two perpendicular sides, a consequence of all of its angles being right. For ten points, name this type of quadrilateral which has four 90-degree angles, whose area is equal to its base times its height.
The British Flag Theorem deals with sums of squares of distances from an interior point in this figure.
{rectangle}s (prompt on {quadrilateral}, {trapezoid}, or {parallelogram}, do not accept or prompt rhombus or square)