### All ISEE Upper Level Quantitative Resources

## Example Questions

### Example Question #61 : Plane Geometry

is a right angle.

Which is the greater quantity?

(a)

(b)

**Possible Answers:**

(a) is the greater quantity

(a) and (b) are equal

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

(b) is the greater quantity

**Correct answer:**

(a) is the greater quantity

Corresponding angles of similar triangles are congruent, so, since , and is right, it follows that

is a right angle of a right triangle . The other two angles must be acute - that is, with measure less than - so .

### Example Question #61 : Plane Geometry

is inscribed in a circle. is a right angle, and .

Which is the greater quantity?

(a)

(b)

**Possible Answers:**

(a) and (b) are equal

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

(a) is the greater quantity

(b) is the greater quantity

**Correct answer:**

(a) and (b) are equal

The figure referenced is below:

has measure , so its corresponding minor arc, , has measure . The inscribed angle that intercepts this arc, which is , has measure half this, or . Since is a right angle, the other acute angle, , has measure

Therefore, .

### Example Question #62 : Plane Geometry

Consider a triangle, , in which , , and . Which is the greater number?

(a) The measure of in degrees

(b)

**Possible Answers:**

(a) and (b) are equal

(b) is the greater quantity

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

(a) is the greater quantity

**Correct answer:**

(a) and (b) are equal

By the Converse of the Pythagorean Theorem, a triangle is right if and only if the sum of the squares of the lengths of the smallest two sides is equal to the square of the longest side. Compare the quantities and

, so is right, with the right angle opposite longest side . Thus, is right and has degree measure 90.

### Example Question #64 : Isee Upper Level (Grades 9 12) Quantitative Reasoning

The length of a side of a square is two-thirds the length of a leg of an isosceles right triangle. Which is the greater quantity?

(a) The area of the square

(b) The area of the triangle

**Possible Answers:**

(b) is greater

(a) and (b) are equal

(a) is greater

It is impossible to tell from the information given

**Correct answer:**

(b) is greater

Let be the length of a leg of the right triangle. Then the sidelength of the square is .

(a) The square has area

(b) The isosceles right triangle has base and height area

, so (b) is greater.

### Example Question #31 : Right Triangles

Two triangles are on the coordinate plane. Each has a vertex at the origin.

Triangle A has its other two vertices at and .

Triangle B has its other two vertices at and .

Which is the greater quantity?

(a) The area of Triangle A

(b) The area of Triangle B

**Possible Answers:**

(b) is greater

It is impossible to tell from the information given

(a) is greater

(a) and (b) are equal

**Correct answer:**

(a) and (b) are equal

Each triangle is a right triangle with legs along the - and -axes, so the area of each can be calculated by taking one-half the product of the two legs.

(a) The horizontal and vertical legs have measures 18 and , respectively, so the triangle has area .

(b) The horizontal and vertical legs have measures and 9, respectively, so the triangle has area .

The areas are equal.

### Example Question #61 : Isee Upper Level (Grades 9 12) Quantitative Reasoning

Construct rectangle , and locate midpoint of side . Now construct segment .

Which is the greater quantity?

(a) The area of Quadrilateral

(b) Three times the area of

**Possible Answers:**

(a) is greater

It is impossible to tell from the information given

(b) is greater

(a) and (b) are equal

**Correct answer:**

(a) and (b) are equal

is a right triangle with right angle , so its legs measure and ; its area is . Since is the midpoint of , , making the area of the triangle

Rectangle has area .

Quadrilateral , which is the portion of not in , has as its area

Therefore, the area of Quadrilateral is three times that of , making (a) and (b) equal.

### Example Question #62 : Triangles

Construct rectangle . Let and be the midpoints of and , respectively, and draw the segments and . Which is the greater quantity?

(a) The area of

(b) The area of

**Possible Answers:**

(b) is greater.

(a) and (b) are equal.

It is impossible to tell from the information given.

(a) is greater.

**Correct answer:**

(a) and (b) are equal.

Each triangle is a right triangle, and each has its two legs as its base and height.

(a) is the midpoint of , so .

The area of is .

(b) is the midpoint of , so .

The area of is

.

The triangles have equal area.

### Example Question #63 : Plane Geometry

The length of a side of a square is one-half the length of the hypotenuse of a triangle. Which is the greater quantity?

(a) The area of the square

(b) The area of the triangle

**Possible Answers:**

It is impossible to tell from the information given.

(b) is greater.

(a) and (b) are equal.

(a) is greater.

**Correct answer:**

(a) is greater.

(a) Let be the sidelength of the square. Then its area is .

(b) In a triangle, the shorter leg is one-half as long as the hypotenuse. The hypotenuse has length , so the shorter leg has length . The longer leg is times as long as the shorter leg, so the longer leg will have length . The area of the triangle is

.

, so ; the square has the greater area.

### Example Question #64 : Plane Geometry

Give the area of the above right triangle in terms of .

**Possible Answers:**

**Correct answer:**

The area of a triangle is half the product of its base and its height; for a right triangle, the legs, which are perpendicular, serve as base and height.

### Example Question #64 : Plane Geometry

Note: Figures NOT drawn to scale.

Refer to the above figures - a right triangle and a square. The area of the triangle is what percent of the area of the square?

**Possible Answers:**

**Correct answer:**

The area of the triangle is

square inches.

The sidelength of the square is inches, so the area of the square is

.

The question becomes "what percent of 576 is 270", which is answered as follows:

The correct answer is .

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