I've been working on a lesson plan for one of my classes and I thought you might be interested in some of the materials I've been preparing. The lesson is meant to teach 3rd graders to indentify right angles, acute angles, and obtuse angles. One of the activities I've been readying is a set of note cards with pictures on them. In the pictures, I've traced some of the angles and numbered them. The students are to tell whether each angle is right, acute, or obtuse. They are then to label each angle ABC. My note cards will be laminated so the students can label them and then erase them. This means I'll be able to reuse them.
Some of my images are photographs of objects like trees, fenses, and planes. Some, of course, are pictures of artwork. The artwork is below. If you want to use the images, copy them into a word document and resize them so they fit on note cards.
In order: 1. John James Audubon's Flamingo, 2. Pierre-Auguste Renoir's Girls at the Piano, 3. Henri Matisse's Jazz, 4. a Greco-Roman bronze sculpture called Boy with Thorn, 5. Gustave Courbet's Cliffs Near Etretat, 6. an Egyptian sculpture of Akhenaten, 7. Andre Derain's The Turning Road, 8. and a color field painting by Piet Mondrian.