ISEE Upper Level Quantitative : Squares

Study concepts, example questions & explanations for ISEE Upper Level Quantitative

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Example Questions

Example Question #232 : Geometry

Which is the greater quantity?

(a) The sidelength of a square with area 400 square inches.

(b) The sidelength of a square with perimeter 80 inches.

Possible Answers:

(a) is greater 

(b) is greater 

(a) and (b) are equal

It is impossible to tell which is greater from the information given

Correct answer:

(a) and (b) are equal

Explanation:

The sidelength of a square is the square root of its area and one-fourth of its perimeter, so:

(a) A square with area 400 square inches has sidelength \(\displaystyle \sqrt{400} = 20\) inches.

(b) A square with perimeter 80 inches has sidelength \(\displaystyle 80 \div 4 = 20\) inches.

The two quantities are equal.

Example Question #233 : Geometry

Which is the greater quantity?

(a) The sidelength of a square with area \(\displaystyle 225\) square inches.

(b) The sidelength of a square with perimeter \(\displaystyle 50\) inches.

Possible Answers:

(a) and (b) are equal.

It is impossible to tell which is greater from the information given.

(a) is greater.

(b) is greater.

Correct answer:

(a) is greater.

Explanation:

The sidelength of a square is the square root of its area and one-fourth of its perimeter, so:

(a) A square with area \(\displaystyle 225\) square inches has sidelength \(\displaystyle \sqrt{225} = 15\) inches.

(b) A square with perimeter \(\displaystyle 50\) inches has sidelength \(\displaystyle 50 \div 4 = 12.5\) inches.

(a) is the greater quantity.

Example Question #234 : Geometry

The perimeter of a square is \(\displaystyle 2 ^{x}\). Give the length of each side in terms of \(\displaystyle x\).

Possible Answers:

\(\displaystyle 2^{x-1}\)

\(\displaystyle 2^{\frac{1}{4}x}\)

\(\displaystyle 2^{x-4}\)

\(\displaystyle 2^{x-2}\)

\(\displaystyle 2^{\frac{1}{2}x}\)

Correct answer:

\(\displaystyle 2^{x-2}\)

Explanation:

Divide the perimeter of a square by 4 to get its sidelength:

\(\displaystyle \frac{2 ^{x} }{4} = \frac{2 ^{x} }{2^{2}} = 2^{x-2}\)

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