The gabled house is [[$ 12.0 $]] m long and [[$ 8.0 $]] m wide. The end of the house consists of a [[$ 3.0 $]] m [[$ \times $]] [[ $ 8.0 $]] m rectangle and an isosceles triangle with a base [[$ 8.0 $]] m. The roof extends over the wall to [[$ 0.5 $]] m on each side of the house, forming eaves. At the design stage, the end wall triangle was thought to be [[$ 2.0 $]] m high, but at the construction stage it was made [[$ 2.5 $]] m. By what percentage did the roof area increase after this change? (Source: Finnish matriculation exam, spring 2000)

Take a picture of your solution and return it to the submission folder.

Answer: The roof area increased by [[$ \% $]].

Solution