On December 20, 2023, Brent will stop offering office hours.

- Video Course
- Video Course Overview
- General GMAT Strategies - 7 videos (free)
- Data Sufficiency - 16 videos (free)
- Arithmetic - 38 videos
- Powers and Roots - 36 videos
- Algebra and Equation Solving - 73 videos
- Word Problems - 48 videos
- Geometry - 42 videos
- Integer Properties - 38 videos
- Statistics - 20 videos
- Counting - 27 videos
- Probability - 23 videos
- Analytical Writing Assessment - 5 videos (free)
- Reading Comprehension - 10 videos (free)
- Critical Reasoning - 38 videos
- Sentence Correction - 70 videos
- Integrated Reasoning - 17 videos

- Study Guide
- Blog
- Philosophy
- Office Hours
- Extras
- Prices

## Comment on

Intersecting Circles## Thanks you so mush for the

## This is blowing my mind

## alternatively to the formula:

then are as usual: (b*h)/2 --> (6*3*root3)/2

## That works too!

That works too!

## if you start of with this can

?

## Great idea!

Great idea!

We know that the area of ONE equilateral triangle is 9√3

So, once you're certain how many equilateral triangle areas you need to subtract (in this case, we must subtract 2 of those areas), then you can start eliminating.

Cheers,

Brent

## Does this qs also deserve a

## Yes, this is definitely a 700

Yes, this is definitely a 700+ level question. VERY tricky!

Aside: if you hover your cursor over each colored square next to the PLAY button, you'll see the difficulty level of each question.

Green: 350 - 500

Yellow: 510 - 650

Red: 660 - 800

Cheers,

Brent

## Hi Brent! Is there a link to

## If you go here (https://www

If you go here (https://www.gmatprepnow.com/content/free-content), you'll find a downloadable pdf of all GMAT math flashcards. They contain more than just Geometry, but I think they're useful.

## man!! i am in love with your

## Thanks for that!

Thanks for that!

## Hi Brent, I solved this

Let the two intersecting points be AB. Draw AB and OP. Let them intersect at X. Area of sector OAB is 12pi. Area of triangle OAB is 9*root(3)

Since the area that we have to find is twice of 12pi - 9*root(3), answer is 24pi - 18root(3)

## Nice work!!

Nice work!!

## Question: DO we have to

## No, you don't need to

No, you don't need to memorize the formula for the volume of a sphere.

If the GMAT were to create a question involving a sphere's volume, they will undoubtedly provide the necessary formula.

Here's an example of such a question: https://gmatclub.com/forum/the-volume-of-a-sphere-with-radius-r-is-4-3-p...

## Another great video Brent and

## All parts inside the blue

All parts inside the blue (and the later yellow) area belong to BOTH circles .

## Thanks Brent for confirmation