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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.

Drag the points A, B and C to see the changes.

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