These activities are centered around the idea of measuring and constructing pitched roofs. Depending on a building's cost, function and location, a roof can either have a very steep pitch (which would mean a very acute angle, like you would find on ski houses in the mountains) or an obtuse angle (like a house in the tropics where it rains a lot and the water has to run off slowly to prevent flooding.)
These activities are designed for students to work on individually or in pairs: the first part involves 8 different buildings with different roof pitches that have to be classified, estimated and then measured with a protractor.
A second set of tasks involves constructing a roof with the correct angle on the building. There is a mixture of acute, obtuse and a right angle, so students get practice constructing all types of angles. This is a challenging activity to get the roof "just right," so don't expect your students to finish quickly.
I have included a set of 10º angle "slices" that students who find working with a protractor very difficult; they can cut out the slices and lay them down side by side along the angle of the roof to get a rough estimate of its measure.