Arectangle with a perimeter of 40m is 2m7, longer than it is wide. determine the dimensions of the rectangle.

Hello from MrBillDoesMath!

9, 11

Discussion:

From the attachment,

P = w + l + w + l

  = 2w + 2l                       => as l = w + 2

  = 2w  + 2( w+2)        

  = 4w + 4

  = 40        (given value)

4w + 4= 40                => subtract 4 from both sides

4w = 40 -4 = 36        => divide both sides by 4

w = 36/4 = 9

This implies that l = w+2 = 9 + 2 = 11

 

Thank you,

MrB

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

Just look outside and then you’ll see where the awnser is