ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Geometry and Measurement Videos 88 videos
SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?
SAT Math: Geometry and Measurement Drill 1, Problem 2. If A = (0, 4), B = (-3, 2), and C = (1, 0), which point is in the interior of angle ABC?
SAT Math 2.3 Geometry and Measurement. Find the length of AB.
SAT Math 6.4 Geometry and Measurement 287 Views
Share It!
Description:
SAT Math 6.4 Geometry and Measurement
Transcript
- 00:03
Here’s your shmoop du jour, brought to you by parallel lines.
- 00:07
Some are more delicious than others.
- 00:11
ABCD is a parallelogram. If angle B is equal to 30°, what is the measure of angle ACB?
- 00:20
Here are the potential answers...
- 00:22
Okay, what do we know about parallelograms…?
Full Transcript
- 00:25
They look like rectangles that an elephant sat on…
- 00:27
Well, we know that opposite sides are… parallel, obviously.
- 00:31
We also know that opposite angles are congruent.
- 00:35
So…because we’re told that angle B is 30 degrees…
- 00:38
…we know that angle D is 30 degrees as well. Great.
- 00:41
We’re dealing with a four-sided polygon, so we must have 360 total degrees.
- 00:46
If 30 and 30…or 60…are already accounted for…
- 00:48
…then the two remaining angles must make up the difference.
- 00:51
So just subtract those 60 degrees from the 360 and we get 300…
- 00:55
and once again we have opposite angles that must be equal.
- 00:59
So…300 divided by 2 is 150.
- 01:03
Line AC is bisecting that angle…leaving us with an angle of 75 degrees.
- 01:09
Answer E.
- 01:10
As in, “Elephant.”
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...