Please help me ill give brainliest and show your work please :)

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Circle d circumscribes abc and abe. which statements about the triangles are true? statement i: the perpendicular bisectors of abc intersect at the same point as those of abe. statement ii: the distance from c to d is the same as the distance from d to e. statement iii: bisects cde. statement iv: the angle bisectors of abc intersect at the same point as those of abe. a. i only b. i and ii c. ii and iv d. i and iii e. iii and iv

6cm10 cma conical paper cup has dimensions as shown in the diagram. how much water can the cup hold when full?