In rectangle JKLM, opposite sides are equal and all angles are 90&deg;.<br><br>LM is opposite JK, so LM = JK = 8 cm.<br>JM is opposite KL, so JM = KL = 4 cm.<br>&ang;KLM = 90&deg; (all angles in a rectangle are right angles).<br><br>Final Answer: LM = 8, JM = 4, &ang;KLM = 90