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

Pieces of Pi## https://gmatclub.com/forum

I am confused by the question. I understand the concept of circumferences and got the bit that the arch 1/6 of the circle. But, at what point in the question did it say that points RTU make up a triangle? Points RTU could be three separate points on the circumference of the circle - couldn't it?

What am I missing here?

## Question link: https:/

Question link: https://gmatclub.com/forum/the-points-r-t-and-u-lie-on-a-circle-that-has...

You're right to say that the arc is 1/6 of the circle.

This means the central angle of ∆RCU is 60°

Take a look at the image Bunuel created at https://gmatclub.com/forum/the-points-r-t-and-u-lie-on-a-circle-that-has...

Since the central angle of ∆RCU is 60°, we can see that ∆RCU is an EQUILATERAL triangle.

Since all sides are equal in an equilateral triangle, each side has length 4.

Does that help?

Cheers,

Brent