Please explain these questions again i didnt understand

gram. The efficiency of the engine is 81 SAreversible engine cycle is shown in the following T-S diagram. 1ne cu 2T T S 2S, 3S, 6) ( 2 The eficiency of a reversible heat eng ine performing this cycle is 2p. Vo) &To P Po Vo To) P.2V) V () 10 () ()6 () n0G T