the inner shape is a rectangle correct? It took me a bit of thinking. there could be a faster way than mine. figure out the magnitude of the inner angle of the shaded region. To do that, use some geometry to find the angle of the outer region. Equilateral triangle is 60/60/60, inside angle is half of the remainder (sum of the angles around the center is 60/60/120/120). Once you know that that angle is 120 degrees, the area of that region of the circle (shaded and white region) is equal to 120/360 or 1/3 the total area of the circle, which is pi(1^2). from that subtract the area of the white region: (pi/3 - √3/4) is that the correct answer?