ISEE Upper Level Quantitative : ISEE Upper Level (grades 9-12) Quantitative Reasoning

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

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Example Questions

Example Question #1 : How To Find Area

Rectangle 1

The above rectangle, which has perimeter 360, is divided into squares of equal size. Give the area of the shaded portion.

Possible Answers:

Correct answer:

Explanation:

The sides of the rectangle, in total, are divided into 18 segments of equal measure, as indicated below:

Rectangle 2

The rectangle has a total perimeter of 360, so each segment - one side of a square - measures . Each square has area , so the shaded portion of the rectangle, which comprises seven squares, has area

.

Example Question #111 : Isee Upper Level (Grades 9 12) Quantitative Reasoning

Seven angles of a convex octagon are congruent; the measure of the eighth is twice that of any one of the other seven. What is the measure of that eighth angle?

Possible Answers:

This octagon cannot exist.

Correct answer:

This octagon cannot exist.

Explanation:

Let  be the measure of any one of the seven congruent angles. Then the one non-congruent angle measures , and the sum of the angle measures in terms of   is .

The angle measures of any convex octagon must add up to . So, to determine :

Therefore, the largest angle must measure , which is impossible since the measure of an angle cannot exceed .

Example Question #111 : Plane Geometry

Which is the greater quantity?

(a) The sum of the measures of the exterior angles of a thirty-sided polygon, one per vertex

(b) The sum of the measures of the exterior angles of a forty-sided polygon, one per vertex

Possible Answers:

(b) is greater

(a) is greater

(a) and (b) are equal

It is impossible to tell from the information given

Correct answer:

(a) and (b) are equal

Explanation:

The Polygon Exterior-Angle Theorem states that the sum of the measures of the exterior angles of any polygon, one per vertex, is . This makes both quantities equal.

Example Question #112 : Plane Geometry

Which is the greater quantity?

(a) The measure of an interior angle of an equilateral triangle

(b) The measure of an exterior angle of a regular octagon

Possible Answers:

(a) is greater.

It is impossible to tell from the information given.

(a) and (b) are equal.

(b) is greater.

Correct answer:

(a) is greater.

Explanation:

Each angle of an equilateral triangle measures .

The sum of the exterior angles of any polygon, one per vertex, is . A regular octagon has eight sides, and, therefore, eight vertices; the measure of one exterior angle is .

This makes (a) greater.

Example Question #113 : Plane Geometry

A regular polygon has exterior angles that measure  each. Which is the greater quantity?

(a) The number of sides of this polygon

(b) 16

Possible Answers:

(a) and (b) are equal 

It is impossible to tell from the information given

(a) is greater

(b) is greater

Correct answer:

(a) is greater

Explanation:

A regular polygon with 16 sides has exterior angles measuring

The polygon in (a) has exterior angles that are narrower, so it must have more than 16 sides. (a) is greater.

Example Question #114 : Plane Geometry

A regular polygon has interior angles that are obtuse. Which is the greater quantity?

(a) The number of sides of the polygon

(b) 4

Possible Answers:

It is impossible to tell from the information given

(a) and (b) are equal 

(a) is greater

(b) is greater

Correct answer:

(a) is greater

Explanation:

A regular four-sided polygon - a square - has four right angles; a regular triangle is equiangular and has three acute (  ) angles.

Any regular polygon with five sides or more has congruent angles that measure at least  each. Therefore, any regular polygon with obtuse angles must have 5 or more sides, making (a) greater.

Example Question #115 : Plane Geometry

A regular polygon has interior angles that measure  each. Which is the greater quantity?

(a) The number of sides of the polygon

(b) 24

Possible Answers:

It is impossible to tell from the information given

(a) is greater

(b) is greater

(a) and (b) are equal 

Correct answer:

(a) and (b) are equal 

Explanation:

A regular polygon with 24 sides has interior angles measuring

Therefore, the polygon in (a) has 24 sides, and the quantities are equal.

Example Question #116 : Plane Geometry

Polygon C is regular. If one exterior angle is taken at each vertex, and the degree measures are added, the sum is 360. Which of the following is the greater quantity?

(a) 12

(b) The number of sides of Polygon C

Possible Answers:

(b) is the greater quantity

(a) and (b) are equal

It cannot be determined which of (a) and (b) is greater

(a) is the greater quantity

Correct answer:

It cannot be determined which of (a) and (b) is greater

Explanation:

In any regular (or other convex) polygon, regardless of the number of sides in the polygon, the sum of the measures of the exterior angles, one per vertex, is . As a consequence, it cannot be determined how many sides the polygon has.

Example Question #117 : Plane Geometry

Polygon B is regular. The measure of each exterior angle of Polygon B is . Which of the following is the greater quantity?

(a) The number of sides of Polygon B

(b) 12

Possible Answers:

It cannot be determined which of (a) and (b) is greater

(b) is the greater quantity

(a) and (b) are equal

(a) is the greater quantity

Correct answer:

(a) and (b) are equal

Explanation:

In any polygon, the sum of the measures of the exterior angles, one per vertex, is ; if the polygon is regular, its exterior angles have the same measure. If the polygon has  sides - and  vertices - then 

and 

This means the polygon has 12 sides, making the quantities equal.

Example Question #119 : Geometry

Polygon A is a regular polygon with interior angles of measure .

Which is the greater quantity?

(a) The number of sides of Polygon A

(b) 10

Possible Answers:

(a) is the greater quantity

(b) is the greater quantity

It cannot be determined which of (a) and (b) is greater

(a) and (b) are equal

Correct answer:

(b) is the greater quantity

Explanation:

If a regular polygon - one with congruent sides and congruent angles - has interior angles of measure , then its exterior angles each have measure . The sum of the measures of the exterior angles, one per vertex, is , so if the polygon has  sides - and  vertices - then 

and 

This means the polygon has 9 sides, making (b) the greater quantity.

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