Answer:
CE = 16
BD = 16
Angle CED = 20°
Explanation:
supposing that 8 is the measure of half the diagonal, doubling it we have the whole diagonal (2 x 8 = 16) which is the answer to CE and BD (the diagonals of a rectangle are equal). To find the angle CED, congruent to BDE, we subtract 140° from the internal sum of the isosceles triangle and we have the sum of the two congruent angles, we divide by 2 and we have the measure of the angle (180 - 140 : 2 = 20°).