GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 23 May 2019, 22:10

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# A semicircle has an area of 40Π. What is its diameter?

Author Message
TAGS:

### Hide Tags

Director
Joined: 08 Jun 2013
Posts: 560
Location: France
GMAT 1: 200 Q1 V1
GPA: 3.82
WE: Consulting (Other)
A semicircle has an area of 40Π. What is its diameter?  [#permalink]

### Show Tags

15 Sep 2018, 15:32
00:00

Difficulty:

35% (medium)

Question Stats:

58% (00:56) correct 42% (01:10) wrong based on 23 sessions

### HideShow timer Statistics

A semicircle has an area of $$40Π$$. What is its diameter?

A) $$2√5$$
B) $$2√10$$
C) $$4√5$$
D) $$4√10$$
E) $$8√5$$

_________________
Everything will fall into place…

There is perfect timing for
everything and everyone.
Never doubt, But Work on
improving yourself,
Keep the faith and
It will all make sense.
Manager
Status: GMAT - Pulling Quant and Verbal together
Joined: 04 Sep 2017
Posts: 165
Location: United States (OH)
GPA: 3.6
WE: Sales (Computer Software)
A semicircle has an area of 40Π. What is its diameter?  [#permalink]

### Show Tags

15 Sep 2018, 17:19
Harshgmat wrote:
A semicircle has an area of $$40Π$$. What is its diameter?

A) $$2√5$$
B) $$2√10$$
C) $$4√5$$
D) $$4√10$$
E) $$8√5$$

Change the Semicircle into a Normal Circle. Then find the Diameter.

Area of a Circle is A = Π$$r^2$$

Semi Circle = $$\frac{1}{2}$$ of a Circle.

So we can multiply the Area by 2 in order to get the Area of a full circle.

Semicircle has an area of $$40Π$$

Circle has an area of 80Π

A = 80Π

r = $$\sqrt{80}$$ = 4$$\sqrt{5}$$

r * 2 = Diameter

4$$\sqrt{5}$$ * 2 = 8$$\sqrt{5}$$

_________________
Would I rather be feared or loved? Easy. Both. I want people to be afraid of how much they love me.

How to sort questions by Topic, Difficulty, and Source:
https://gmatclub.com/forum/search.php?view=search_tags
A semicircle has an area of 40Π. What is its diameter?   [#permalink] 15 Sep 2018, 17:19
Display posts from previous: Sort by