Area
Understand what area measures, distinguish it from perimeter, and use the defining formulas for common triangles and quadrilaterals with correct square units.
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4 bilingual articles
Area: Meaning, Square Units and Plane-Figure Formulas
Understand what area measures, distinguish it from perimeter, and use the defining formulas for common triangles and quadrilaterals with correct square units.
Open article →Area of a Circle and Sector: Radius, Angle and Pi
Learn the parts of a circle, choose an exact or approximate value of pi, and calculate circle, semicircle, quadrant and sector areas from radius and central angle.
Open article →Combined and Shaded Areas: Add, Subtract and Check
Break a combined or shaded figure into familiar shapes, choose addition or subtraction, and connect square-unit area to practical cost without counting hidden shared edges.
Open article →Irregular Polygon Area: A Step-by-Step Strategy
Find an irregular polygon's area by choosing useful divisions, applying perpendicular heights, summing simple-shape areas and checking units and completeness.
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