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Find the circumference of a circle with radius 4 cm. Use 3.14 for π.
C = 2πr = 2(3.14)(4) = 25.12 cm
A circle has a diameter of 10 in. Find its area.
r = 5, A = πr² = 3.14 × 25 = 78.5 in²
A garden is a circle with radius 6 ft. Find its area.
A = 3.14 × 6 × 2 = 37.68
A wheel travels 50.24 ft in one full turn. Find its diameter.
d = 50.24 ÷ 3.14 = 1b ft
Why 4 needs you: the grader can't tell if the last digit is a 6 or a b.
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Template sources and licenses
- Angle Relationships. Adapted from IM 6–8 Math by Open Up Resources and Illustrative Mathematics, CC BY 4.0. License. Selected practice problems from four lessons, renumbered and laid out as one printable worksheet with answer space. Problem text and diagrams are unchanged.
- Solving Linear Equations. Adapted from IM 6–8 Math by Open Up Resources and Illustrative Mathematics, CC BY 4.0. License. Selected practice problems from three lessons, renumbered and laid out as one printable worksheet with answer space. Problem text is unchanged.
- Linear Relationships in Context. Adapted from IM 6–8 Math by Open Up Resources and Illustrative Mathematics, CC BY 4.0. License. Selected practice problems from three lessons, renumbered and laid out as one printable worksheet with answer space. Problem text, tables and graphs are unchanged.
- Right Triangles and Trigonometry. Adapted from IM 9–12 Math Geometry by Illustrative Mathematics, CC BY 4.0. License. Selected practice problems from three lessons, renumbered and laid out as one printable worksheet with answer space. Problem text and diagrams are unchanged.