Areas of plane figures

Learn how to calculate areas and perimeters of various plane shapes: the triangle, quadrilaterals, regular polygons and the circle.

  1. The annulus

    Difficulty: 3

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  2. The circle

    Difficulty: 2

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  3. The lune

    Difficulty: 3

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  4. The rectangle

    Difficulty: 1

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  5. The regular polygon

    Difficulty: 2

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  6. The rhomboid

    Difficulty: 2

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  7. The rhombus

    Difficulty: 2

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  8. The square

    Difficulty: 1

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  9. The trapezoid

    Difficulty: 2

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  10. The triangle

    Difficulty: 1

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