22cmStep-by-step explanation:Step 1 . Identify the lengths of all sides. A rectangle has two lengths and two widths. The lengths are 8cm and 8cm. The widths are 3cm and 3cm.Step 2 . Add the lengths of all sides. Perimeter P= length + width + length + width P= 8cm + 3cm + 8cm + 3cmP=22cm.