Here is the plan of a nursery that has just been built. It consists of five parts corresponding to five simple plane figures

The diagram is not to scale. The coasts are expressed in meters.
1) Indicate the geometric figure corresponding to the following rooms: The games room: -The reception area: -The changing area:
2) We want to calculate the length CH: a) Propose a method to calculate this length. b) Calculate, in meters, the length CH and round the result to tenths. NB: In a triangle ABC right-angled in A, BC AB+ AC
3) In order to organize the cleaning of the floor of the nursery, it is necessary to know the total area of ​​the building. a) Calculate the area of ​​the playroom in square metres. Record this value on the plan. b) Taking CH 5.6m, calculate, in square meters, the reception area. Record this value on the schedule. c) Indicate the calculation to verify that the total area of ​​the nursery is 168.9m²