Go to https://student.desmos.com/join/m88vvt to complete all activities there. Pay attention to how you can use several shapes to form a new one.

2. If the small circles' radius is 1, what is the big circle's area? What is the area of the dark grey part?

3. If you know the area of square ABCD is 4 and E is the midpoint of DC, can you find out what is the length of AC and BE? (Hint: pythagorean theorem)

4. How many triangles can you find on the cube? Each edge of the cube measures 2 cm. If point I and J are both midpoints, which type of quadrilateral do you think CIEJ is? (Hint: pythagorean theorem)