Here are some online resources for grade 7 circles unit in Illinois:

1. Khan Academy: Khan Academy offers a comprehensive set of video lessons and practice exercises on circles. You can access their grade 7 circles unit here: https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-circles

2. Math Antics: Math Antics provides engaging video lessons on various math topics, including circles. You can watch their circle-related videos here: https://www.mathantics.com/section/lesson-video/circles

3. IXL: IXL is an online learning platform that offers interactive practice exercises for various math topics. They have a dedicated section for circles in their grade 7 curriculum. You can access their circles exercises here: https://www.ixl.com/math/grade-7/circles

4. Math Worksheets 4 Kids: Math Worksheets 4 Kids provides free printable worksheets on circles for grade 7 students. You can find a variety of worksheets, including finding the circumference, area, and radius of circles, as well as solving circle-related word problems. Access their circle worksheets here: https://www.mathworksheets4kids.com/circles.php

5. Education.com: Education.com offers a collection of worksheets, activities, and games on circles for grade 7 students. You can find various resources to practice concepts like circumference, area, and diameter of circles. Access their circle resources here: https://www.education.com/resources/circles/

Remember to check with your teacher or school district to ensure that these resources align with the specific curriculum and standards followed in Illinois.