ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Circles Videos 25 videos
This video can run circles around other videos about circles. Sir Cumference, of Round Table fame, explains all the properties of… well, circles....
Time to learn about the area of a sector. And no, that's not the sector's bedroom with a bumper sticker on the door that reads, "GO AWAY."
Equations of circles are a no-brainer. If aliens can do it, so can you. All you do is substitute the center of the circle's coordinates into the eq...
SAT Math 5.1 Geometry and Measurement 219 Views
Share It!
Description:
SAT Math 5.1 Geometry and Measurement
Transcript
- 00:02
Here’s your shmoop du jour, brought to you by 45 degrees.
- 00:06
If a right angle is 90 degrees, we guess this angle is only half right.
- 00:12
What angle is made when the hands of a clock are at 2:30?
- 00:15
Here are the potential answers...
- 00:18
Alright, where to begin….
Full Transcript
- 00:20
so… a “clock” is this type of antiquated time-telling device used in the era before cell phones…
- 00:27
All right, so we’ve got our minute hand, which is obviously pointing to the…minute.
- 00:31
The hour hand, however, is a bit trickier.
- 00:34
Rather than making a big jump suddenly from the 2 to the 3 at some point,
- 00:38
it meanders slowly during the hour...
- 00:40
But we’re dealing with 2:30, which should be easy –
- 00:43
we’re exactly halfway between 2 and 3 o’clock, right here.
- 00:48
We know that a circle has 360 total degrees…
- 00:51
…so the angle between any two numbers on a clock face must be one-twelfth of that…or 30 degrees.
- 00:58
Looking at our hands…not those, focus on the problem, please…
- 01:02
…we can see that we are looking for an angle equivalent to 3 and a half hours.
- 01:07
At 3.5 times 30 or 105… so our solution is choice B.
Related Videos
SAT Math 2.1 Geometry and Measurement. What is the measure of angle z in terms of x and y?
In 2014, the unemployment rate of one county in California was 7%. In another county, the unemployment rate was 11%. Which of the following express...
Angela is making cookies for a bake sale. She expects each batch of her cookies to sell for $40. It costs her $10 to make one batch of cookies, and...