Rectangle ABCD is shown... please help image attatched!!

∠1=∠3 (alternate anges)

∠3=∠4=90°

∴ΔABC and Δ FEC are similar (AA postate)

∴=

(cross multiply)

(BC)(CE)=(AB)(EF)

i think the answer is d im not sure

“ a line segment that has the endpoints on the circle and passes through the midpoint is called the diameter. the diameter is twice the size of the radius. a line segment that has its endpoints on the circular border but does not pass through the midpoint is called a chord. a circle is the same as 360 small circle up the number 0 . i hope this .