whai s rectangle .....
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A parallelogram in which each angle is right angle is called rectangle.
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ᵃ ʳᵉᶜᵗᵃⁿᵍˡᵉ ⁱˢ ᵃ ᶠᵒᵘʳ ˢⁱᵈᵉᵈ-ᵠᵘᵃᵈʳⁱˡᵃᵗᵉʳᵃˡ ʰᵃᵛⁱⁿᵍ ᵃˡˡ ᵗʰᵉ ⁱⁿᵗᵉʳⁿᵃˡ ᵃⁿᵍˡᵉˢ ᵗᵒ ᵇᵉ ʳⁱᵍʰᵗ-ᵃⁿᵍˡᵉᵈ (90ᵒ).
ⁱᵗ ⁱˢ ᵗᵒ ᵇᵉ ⁿᵒᵗᵉᵈ ᵗʰᵃᵗ ⁱⁿ ᵃ ʳᵉᶜᵗᵃⁿᵍˡᵉ ᵗʰᵉ ᵒᵖᵖᵒˢⁱᵗᵉ ˢⁱᵈᵉˢ ᵃʳᵉ ᵉᵠᵘᵃˡ ⁱⁿ ˡᵉⁿᵍᵗʰ ʷʰⁱᶜʰ ᵐᵃᵏᵉˢ ⁱᵗ ᵈⁱᶠᶠᵉʳᵉⁿᵗ ᶠʳᵒᵐ ᵃ ˢᵠᵘᵃʳᵉ.
ᶠᵒʳ ᵉˣᵃᵐᵖˡᵉ, ⁱᶠ ᵒⁿᵉ ˢⁱᵈᵉ ᵒᶠ ᵃ ʳᵉᶜᵗᵃⁿᵍˡᵉ ⁱˢ 20 ᶜᵐ, ᵗʰᵉⁿ ᵗʰᵉ ˢⁱᵈᵉ ᵒᵖᵖᵒˢⁱᵗᵉ ᵗᵒ ⁱᵗ ⁱˢ ᵃˡˢᵒ 20 ᶜᵐ.
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