Dragan

Hello Guest,               100%  of  40  is  40   NOT  80

This question is simple                100%  :   40 = X%  :  90

                                                     X = (100% * 90) / 40  = 225%

                                 Therefore:    90  is  225%  of  40  

Hello guest,

If the width is  x = 18  then the length is  2 * x + 1   

Find the length of a rectangle given that the perimeter is 110 cm and the length is 1cm more than twice the width.

110 - 2 = 108

108 / 6 = 18

The width    a = 18 cm

The length   b = 2 * 18 + 1         b = 37 cm    

This may help you a bit; I hope...

what is 9+10

9 + 10 =  sqrt(3249) / 3   

Triangles  BCD, ACG, and GDN are similar;  all of them are  30-60-90

Let's denote the intersection point of AF and BD with a leter N

BN = 13 * tan(30°) = 7.505

DN = 1 / cos (30°)  = 1.155

BD = BN + DN = 8.66

CD = BD / cos (30°) = 10

Circle radius r = CD / 2 = 5

EG = sqrt [ r² - ( r - 1 )² ] = 3

CG = CD - GD = 9

AG = CG / tan (30°)  = 15.588

EA = AG - EG = 12.588    

Hello guest! Agreed.  I should've added a word  reality  

What about this:       sqrt( |-25| ) = sqrt ( 25 )  

can you get a square root out of a negative nubmer

The answer is NO!              sqrt ( - 25 ) = error   

                       Because:      ( - 5 )*( + 5 ) = - 25  

a = 2      c = 6

Side   b = sqrt ( 6² - 2² )               b = 5.656854249 in       

Area    A = b * 1                      A = 5.656854249 sq. in  

What's the question here?     Pardon me...

I would call it a half tangent