adult ed geometry
posted by antonne .
Adult education due to the level thanks  An arc ABC is one quarter of a circle with center B and radius 6. Rectangle EDFB is inscribed in ABC. If ED + DF = 8, find the perimeter ADCFE. Round your answer to the nearest hundredth.

I don't see how you can incribe a rectangle in 1/4 of a circle.
Please clarify 
draw upper right of 1/4 of a circlewith (one quarter of a circle) 3 sides and it would have points at ABC going clockwise. Starting clockwise, the curved side would be ADC, then a straight line of the bottom CFB, going up a straight line BEA. The rectangle, the tall way, EDFB. Inside the rectangle are 2 right triangles, EBF and FDE. B is the center and radius 6.