Length is 4 x radius = 8 mm
Width is a bit more involved. If you connect the centers of the three circles, you get an equilateral triangle with sides = 4 mm. Draw an altitude from the bottom vertex (center of bottom circle) to the midpoint of the line connecting the centers of the upper circles. The altitude splits the equilateral triangle into two 30-60-90 triangles. Use the ratios of sides of a 30-60-90 triangle to determine the length of the altitude . The width of the rectangle is W = altitude + 4
Area = L x W = 8 x W = ___ mm2 [Answer is 16√3 + 32 mm2]
