# Lesson: Circle Properties

## Comment on Circle Properties

### Question #8 requires a rule

Question #8 requires a rule regarding cyclic quadrilaterals. These are quadrilaterals that are inscribed in a circle.

For all cyclic quadrilaterals, any two angles that are opposite each other will add to 180 degrees.

So, for question #8, x + 135 = 180 degrees, so x = 45

For the GMAT, you don't need to know anything about cyclic quadrilaterals. So, you can disregard that question.

Sorry, I didn't notice question #8 when I posted the link. I have edited the link accordingly.

### Hi Brent, can you please me

Hi Brent, can you please me understand what's a slope?

Referring to the question below https://gmatclub.com/forum/in-the-xy-plane-line-l-intersects-a-circle-with-center-158232.html

### I'm happy to help.

I'm happy to help.
Here's our video on slope: https://www.gmatprepnow.com/module/gmat-algebra-and-equation-solving/vid...

Please let me know if you have any questions.

Cheers,
Brent

### Hi Brent,

Hi Brent,

Can you explain the following

A thin piece of wire 40 meters long is cut into two pieces. One piece is used to form a circle with radius r, and the other is used to form a square. No wire is left over. Which of the following represents the total area, in square meters, of the circular and the square regions in terms of r?

### Good question.

Good question.
I provide two different solutions here: https://www.beatthegmat.com/a-thin-piece-of-wire-40-metres-long-t291379....

Cheers,
Brent

### hey Brent,

hey Brent,
I found the last couple of questions very tough. Number of angles and figures had to be spotted and calculated. I couldn't solve them even in 5 minutes. Can you provide me similar problems to improve my technique?

Thanks

### You can use GMAT Club's

You can use GMAT Club's question filter (at https://gmatclub.com/forum/search.php?view=search_tags) to isolate 700-level Geometry questions to practice with.

### lmao, you know How I got this

lmao, you know How I got this question?

https://gmatclub.com/forum/in-the-above-figure-the-small-circle-and-big-269597.html

3*6 = 18, eliminated A to D