DS Area

Question

DS Area

mbagal1 · Answer

I would have to say D, unless I misunderstood the question.

1) If it's a square, 4*L = 300, so length of each side and L^2 (area) can be determined

2) if one side is 30, other side is 270, so area is 270*30.

Fig · Answer

(B) for me

From 1: Let set s : the side of 1 square As a square is a special rectangle but so still a rectangle, we have 2 cases: > The 4 cubes in a raw (the lenght = 4s and the width = s): o perimeter = 2*(s + 4*s) = 300 o s = 150/5 = 30 o aera = 4s*s = 4s^2 = 4*30^2 = 3600 or > The 2 cubes in a raw and 2 raws forming a scare (the lenght = 2s and the width = 2s): o perimeter = 4*2*s = 300 o s = 150/4 = 75/2 o aera = (2s)^2 = (75)^2 INSUFF From 2: Let set L = lenght of the rectangle 2*(L+30) = 300 <=> L = 120 Thus, Aera = L*30 = 120 * 30 = 3600 SUFF

Googlore · Answer

I got B, too. Not sure if this is too simplistic but....
 from the stem we have 2L + 2w = 300 where L is length and W is width

1) Tells us that LW/4 = an integer. It's not enough. So, INSUF. (Is this right?)

2) We get 2*30 + 2W = 300. W = 120. and L = 30. Area is 3600.

mbagal1 · Answer

Yes, Fig is right, A is insufficient, I wasn't thinking clearly.

Damager · Answer

SQARE SHOULD BE TREATED LIKE A SQARE IF U SAY SQAURE IS RECTANGLE AND CONCLUDE SQAURE DOES NOT HAVE EQUAL SIDES THEN ITS NOT A SQARE

DEFINITION OF SQARE SUPERSIDES THE DEFINITION OF RECTANGLE

(1)( L+L)4=3600 we have only one value of L hence only one area

(2) already explained by u

Fig · Answer

I believe that the defintions to qualify a figure are based on fundamentals that make independant the way to call this figure. 

In addition, they are never excluding one another. Every time, we go in deeper level or sub group of a bigger group.

Level 0 : The figure is a polygon
Level 1 : The figure is a quadrilateral : a polygon of 4 vertices and 4 sides
Level 2 : The figure is a parallelogram: a quadrilateral with parallel opposite sides
Level 3 : The figue is a rectangle : a parallelogram with 1 right angle
Level 4 : The figue is a scare : a rectangle with 4 sides of the same lenght.

karlfurt · Answer

OA is B!
I didn't know that a square is a rectangle...

Fig · Answer

.... Actually, it could be also considered a rhombus

... Something that could be useful

gk3.14 · Answer

Fig,

1. states that the rectangle can be divided into 4 equal squares. Does that not require the sides to be equal?

Can you please explain?

Thanks

Fig · Answer

Yes

... I suggest u to have a look on the figure just below. In this picture, I have drawn the 2 possible cases. The sides of the squares are equal within a same shape.

Comparing the 2 ways to build a possibility, we notice that the squares used are different in order to obtain a same perimeter for both ways

. On my draw, well, I used the same squares but the perimeters are different (U could count the number of square side that create each perimeter : 10 and 8)

gk3.14 · Answer

That was excellent..
Thanks Fig..

yogeshsheth · Answer

Excellent one!!! gr8 explanation!!

anindyat · Answer

Great explanation by Fig
I was also about to do the mistake ..
Square is a special type of rectangle

Fig · Answer

Thanks guys

MBAlad · Answer

Scary - I would've picked B if this was the test and not given it a second thought.

What is source of question?

DS Area

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