Question

please solve this problem corectly

Answer 1

Given - ABCD is a trapezium
In the Right angle triangle ADE
AD² = AE²+DE²
5² = 4²+ DE²
25 = 16 + DE²
25-16 = DE²
  9 = DE²
√9 = DE
  3 = DE
⇒ DE = 3 cm
Similarly , FC= 3cm
∴ DC = ( 3+7+3 ) cm = 13cm