Find the numbers that has been multiplied by 100 =163,100

Which formula gives the area of a triangle? a=1/2(b+h)

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

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