Core geometry formulas and terms tested on the ISEE and SSAT quantitative sections. Front: the term or formula. Back: definition or formula with a brief usage note.
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- Rectangle perimeter formula
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P = 2l + 2w, where l is length and w is width- Rectangle area formula
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A = l x w, where l is length and w is width- Triangle area formula
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A = (1/2) x b x h, where b is base and h is height- Square area formula
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A = s^2, where s is the side length- Circle circumference formula
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C = 2πr or C = πd, where r is radius and d is diameter- Circle area formula
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A = πr^2, where r is radius- Parallelogram area formula
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A = b x h, where b is base and h is height- Trapezoid area formula
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A = (1/2) x (b1 + b2) x h, where b1 and b2 are the parallel bases and h is height- Rectangular prism volume formula
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V = l x w x h, where l is length, w is width, and h is height- Cube volume formula
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V = s^3, where s is the side length- Cylinder volume formula
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V = πr^2h, where r is radius and h is height- Sphere volume formula
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V = (4/3)πr^3, where r is radius- What is an acute angle?
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An angle that measures less than 90 degrees- What is a right angle?
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An angle that measures exactly 90 degrees, often marked with a small square- What is an obtuse angle?
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An angle that measures more than 90 degrees but less than 180 degrees
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