All SAT Math Resources
Example Questions
Example Question #1 : How To Find The Length Of A Chord
Figure is not drawn to scale
In the provided diagram, the ratio of the length of to that of is 7 to 2. Evaluate the measure of .
Cannot be determined
Cannot be determined
The measure of the angle formed by the two secants to the circle from a point outside the circle is equal to half the difference of the two arcs they intercept; that is,
The ratio of the degree measure of to that of is that of their lengths, which is 7 to 2. Therefore,
Letting :
Therefore, in terms of :
Without further information, however, we cannot determine the value of or that of . Therefore, the given information is insufficient.
Example Question #1 : How To Find The Angle Of Clock Hands
It is 4 o’clock. What is the measure of the angle formed between the hour hand and the minute hand?
At four o’clock the minute hand is on the 12 and the hour hand is on the 4. The angle formed is 4/12 of the total number of degrees in a circle, 360.
4/12 * 360 = 120 degrees
Example Question #1 : How To Find The Angle Of Clock Hands
If a clock reads 8:15 PM, what angle do the hands make?
A clock is a circle, and a circle always contains 360 degrees. Since there are 60 minutes on a clock, each minute mark is 6 degrees.
The minute hand on the clock will point at 15 minutes, allowing us to calculate it's position on the circle.
Since there are 12 hours on the clock, each hour mark is 30 degrees.
We can calculate where the hour hand will be at 8:00.
However, the hour hand will actually be between the 8 and the 9, since we are looking at 8:15 rather than an absolute hour mark. 15 minutes is equal to one-fourth of an hour. Use the same equation to find the additional position of the hour hand.
We are looking for the angle between the two hands of the clock. The will be equal to the difference between the two angle measures.
Example Question #1 : How To Find The Angle Of Clock Hands
What is the measure of the smaller angle formed by the hands of an analog watch if the hour hand is on the 10 and the minute hand is on the 2?
30°
56°
90°
120°
45°
120°
A analog clock is divided up into 12 sectors, based on the numbers 1–12. One sector represents 30 degrees (360/12 = 30). If the hour hand is directly on the 10, and the minute hand is on the 2, that means there are 4 sectors of 30 degrees between then, thus they are 120 degrees apart (30 * 4 = 120).
Example Question #1 : How To Find The Angle Of Clock Hands
At , what angle is between the hour and minute hand on a clock?
At , the hour hand is on the and the minute hand is at the . There are spaces on a clock, and these hands are separated by spaces.
Thus, the angle between them is the degrees of the entire clcok, which is .
Therefore, we multiply these to get our answer.
We can cancel out as we multiply to get:
Example Question #3 : How To Find The Angle Of Clock Hands
What is the measure, in degrees, of the acute angle formed by the hands of a 12-hour clock that reads exactly 3:10?
35°
60°
72°
65°
55°
35°
The entire clock measures 360°. As the clock is divided into 12 sections, the distance between each number is equivalent to 30° (360/12). The distance between the 2 and the 3 on the clock is 30°. One has to account, however, for the 10 minutes that have passed. 10 minutes is 1/6 of an hour so the hour hand has also moved 1/6 of the distance between the 3 and the 4, which adds 5° (1/6 of 30°). The total measure of the angle, therefore, is 35°.
Example Question #1 : How To Find The Angle Of Clock Hands
If it is 4:00, what is the measure of the angle between the minute and hour hands of the clock?
100 degrees
45 degrees
90 degrees
125 degrees
120 degrees
120 degrees
A clock takes the shape of a circle, which is composed of 360 degrees. There are 12 numbers on a clock that represent the hours. With this in mind, we can say that each number represents an angle. The measure of the angle between each number is given by .
If it is 4:00, then the minute hand is pointing towards 12 while the hour hand points towards 4.
Therefore, we can say that the angle between the two hands is degrees.
Another way to think of this is to imagine the clock at a nearby time. At 3:00, the hands of the clock form a right angle of 90 degrees. Since we know that each number on the clock is separated by 30 degrees, we can simply add 30 to 90 degrees and get 120 degrees for the angle at 4:00.
Example Question #1 : How To Find The Angle Of Clock Hands
If it is 2:00 PM, what is the measure of the angle between the minute and hour hands of the clock?
60 degrees
120 degrees
90 degrees
30 degrees
45 degrees
60 degrees
First note that a clock is a circle made of 360 degrees, and that each number represents an angle and the separation between them is 360/12 = 30. And at 2:00, the minute hand is on the 12 and the hour hand is on the 2. The correct answer is 2 * 30 = 60 degrees.
Example Question #1 : Circles
Two pizzas are made to the same dimensions. The only difference is that Pizza 1 is cut into pieces at 30° angles and Pizza 2 is cut at 45° angles. They are sold by the piece, the first for $1.95 per slice and the second for $2.25 per slice. What is the difference in total revenue between Pizza 2 and Pizza 1?
–$2.70
–$5.40
$0
$5.40
$2.70
–$5.40
First, let's calculate how many slices there are per pizza. This is done by dividing 360° by the respective slice degrees:
Pizza 1: 360/30 = 12 slices
Pizza 2: 360/45 = 8 slices
Now, the total amount made per pizza is calculated by multiplying the number of slices by the respective cost per slice:
Pizza 1: 12 * 1.95 = $23.40
Pizza 2: 8 * 2.25 = $18.00
The difference between Pizza 2 and Pizza 1 is thus represented by: 18 – 23.40 = –$5.40
Example Question #1 : Plane Geometry
A circular, 8-slice pizza is placed in a square box that has dimensions four inches larger than the diameter of the pizza. If the box covers a surface area of 256 in2, what is the surface area of one piece of pizza?
18π in2
144π in2
4.5π in2
36π in2
9π in2
4.5π in2
The first thing to do is calculate the dimensions of the pizza box. Based on our data, we know 256 = s2. Solving for s (by taking the square root of both sides), we get 16 = s (or s = 16).
Now, we know that the diameter of the pizza is four inches less than 16 inches. That is, it is 12 inches. Be careful! The area of the circle is given in terms of radius, which is half the diameter, or 6 inches. Therefore, the area of the pizza is π * 62 = 36π in2. If the pizza is 8-slices, one slice is equal to 1/8 of the total pizza or (36π)/8 = 4.5π in2.