<prompt> Hesabu eneo la mstatili na pande 5ft na 18ft.  <response>: Eneo la mstatili ni kutokana na formula urefu × upana . Kutumia pande zilizotolewa, 5ft na 18ft, eneo ni mahesabu kama 5 ft × 18 ft 90 sq ft . Hivyo, eneo la mstatili ni 90 sq ft. 