Calculate area, perimeter, and diagonal of rectangles instantly.
Multiply length by width. For a 10×6 rectangle: Area = 10 × 6 = 60 square units.
Perimeter = 2(length + width). It's the total distance around the rectangle.
Use Pythagorean theorem: diagonal = √(length² + width²). For 10×6: √(100+36) = √136 ≈ 11.66
Area is the space inside (square units). Perimeter is the distance around the edge (linear units).
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