Cual es la fórmula del área de un triángulo

Ineed if you could explain and give me the answer you! this needs done

Neoli is a nurse who works each day from 8: 00 am to 4: 00 pm at the blood collection centre. she takes 45 minutes for her lunch break. on average, it takes neoli 15 minutes to collect each sample and record the patient's details. on average, how many patients can neoli see each day?

Someone me what is the area of this figure? 18m 18m 8m 16m