# Area Problem

- Author:
- Angelina S T Lam

- Topic:
- Area

A concert hall

*ABC*which is in a triangular shape. The hall is located by a straight road*DEF*, where*DE*= 40 m and*EF*= 60 m. The length of the paths*AD*,*BE*and*CF*are 50 m, 30 m and 80 m respectively. Find the area of the concert hall*ABC*.