SAT II Math II : Geometry

Study concepts, example questions & explanations for SAT II Math II

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Example Questions

Example Question #371 : Sat Subject Test In Math Ii

 

 

 

Rhombus

Solve for x and y using the rules of quadrilateral

Possible Answers:

x=6, y=10

x=2, y=4

x=9, y=6

x=6, y=9

Correct answer:

x=6, y=9

Explanation:

By using the rules of quadrilaterals we know that oppisite sides are congruent on a rhombus. Therefore, we set up an equation to solve for x. Then we will use that number and substitute it in for x and solve for y.

 

Example Question #71 : 2 Dimensional Geometry

Chords  and  intersect at point  is twice as long as  and 

Give the length of .

Possible Answers:

Correct answer:

Explanation:

If we let , then 

The figure referenced is below (not drawn to scale):

Chords

If two chords intersect inside the circle, then the cut each other so that for each chord, the product of the lengths of the two parts is the same; in other words,

Setting , and solving for :

Taking the positive square root of both sides:

,

the correct length of .

Example Question #1 : Other 2 Dimensional Geometry

Which of the following describes a triangle with sides of length 9 feet, 4 yards, and 180 inches?

Possible Answers:

The triangle is right and isosceles, but not equilateral.

The triangle is right and scalene.

The triangle is acute and isosceles, but not equilateral.

The triangle is acute and scalene.

The triangle is acute and equilateral.

Correct answer:

The triangle is right and scalene.

Explanation:

3 feet make a yard, so 9 feet is equal to 3 yards. 36 inches make a yard, so 180 inches is equal to  yards. That makes this a 3-4-5 triangle. 3-4-5 is a well-known Pythagorean triple; that is, they have the relationship

and any triangle with these three sidelengths is a right triangle. Also, since the three sides are of different lengths, the triangle is scalene.

The correct response is that the triangle is right and scalene.

Example Question #371 : Sat Subject Test In Math Ii

Which of the following describes a triangle with sides of length two yards, eight feet, and ten feet?

Possible Answers:

The triangle is right and scalene.

The triangle cannot exist.

The triangle is acute and isosceles.

The triangle is right and isosceles.

The triangle is acute and scalene.

Correct answer:

The triangle is right and scalene.

Explanation:

Two yards is equal to six feet. The sidelengths are 6, 8, and 10, which form a well-known Pythagorean triple with the relationship

The triangle is therefore right. Since no two sides have the same length, it is also scalene.

Example Question #74 : Geometry

Garden

The above figure shows a square garden (in green) surrounded by a dirt path  feet wide throughout. Which of the following expressions gives the distance, in feet, from one corner of the garden to the opposite corner?

Possible Answers:

Correct answer:

Explanation:

The sidelength of the garden is  feet less than that of the entire lot - that is, . Since the garden is square, the path from one corner to the other is a diagonal of a square, which has length  times the sidelength. This is 

 feet.

Example Question #4 : Other 2 Dimensional Geometry

Garden

The above figure shows a square garden (in green) surrounded by a dirt path six feet wide throughout. Which of the following expressions gives the distance, in feet, from one corner of the garden to the opposite corner?

Possible Answers:

Correct answer:

Explanation:

The sidelength of the garden is  less than that of the entire lot - that is, . Since the garden is square, the path from one corner to the other is a diagonal of a square, which has length  times the sidelength. This is 

 feet.

Example Question #5 : Other 2 Dimensional Geometry

A circle is inscribed inside a square that touches all edges of the square. The square has a length of 3.  What is the area of the region inside the square and outside the edge of the circle?

Possible Answers:

Correct answer:

Explanation:

Solve for the area of the square.

Solve for the area of the circle.  Given the information that the circle touches all sides of the square, the diameter is equal to the side length of the square.

This means that the radius is half the length of the square:  

Substitute the radius.

Subtract the area of the square and the circle to determine the area desired.

The answer is:  

Example Question #71 : Geometry

Inscribed

Figure is not drawn to scale

 is a diameter of the circle; its length is ten; furthermore we know the following:

Give the length of  (nearest tenth)

Possible Answers:

Correct answer:

Explanation:

Locate , the center of the circle, which is the midpoint of ; draw radius  is formed. The central angle that intercepts  is , so  and , being radii of the circle, have length half the diameter of ten, or five. The diagram is below.

Inscribed

By the Law of Cosines, given two sides of a triangle of length  and , and their included angle of measure , the length of the third side  can be calculated using the formula 

Setting , solve for :

Taking the square root of both sides:

Example Question #1 : Volume

One cubic meter is equal to one thousand liters.

A circular swimming pool is  meters in diameter and  meters deep throughout. How many liters of water does it hold?

Possible Answers:

Correct answer:

Explanation:

The pool can be seen as a cylinder with depth (or height) , and a base with diameter  - and, subsequently, radius half this, or . The volume of the pool in cubic meters is 

Multiply this number of cubic meters by 1,000 liters per cubic meter:

Example Question #2 : Volume

A water tank takes the shape of a sphere whose exterior has radius 16 feet; the tank is three inches thick throughout. To the nearest hundred, give the surface area of the interior of the tank in square feet.

Possible Answers:

Correct answer:

Explanation:

Three inches is equal to 0.25 feet, so the radius of the interior of the tank is 

 feet.

The surface area of the interior of the tank can be calculated using the formula

,

which rounds to 3,100 square feet.

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