The bases of trapezoid $ABCD$ are $\overline{AB}$ and $\overline{CD}$. We are given that $CD = 8$, $AD = BC = 7$, and $BD = 9$. Find the area of the trapezoid.
Hello AoPS administrator,
It has come to my attention that someone is posing as an "administrator" and threating AoPS students. It is proven that your believed seniority is false because here at AoPS, we have no administrative roles, and further don't look around on third party websites for information regarding Alcumus. Furthermore, AoPS does not have the power to look up IP addresses on a third party website. Therefore, the actions you have taken towards our students are harmful towards their learning, and if you do AoPS, this is not funny and the offender sill not be allowed to do AoPS anymore. Everybody working at Art of Problem Solving is taught to stay calm under many conditions, so if you are actually staff, you will eventually be found and fired. We really don't have that many staff here at AoPS.
Best regards,
Richard
It's not cheating, you should mind your own business. Some of us don't always have the help we need and get extremely frustrated on problems, so we ask here for help before solving
lol AoPS
well, maybe not. It just might mean that AB is shorter than CD. In that case,
h = 3√5 and x = -2, so
CD=8 and AB=4, making the area
(8+4)/2 (3√5) = 18√5