+0  
 
+1
254
18
avatar+2442 

Need help with 58 and 61

 Apr 24, 2018
 #1
avatar+2 
-1

#58 is 640

 Apr 24, 2018
 #2
avatar+17223 
+1

I assume since you need help with #61 , you already solved  60 and 59

  then  use pythagorean theorem to find RQ

RQ ^2  = RS ^2 + 16^2      ( RS=8 BTW)

 Apr 24, 2018
 #3
avatar+2442 
0

Mhm CPhill helped me with 59 and 60

Also, for 61 would it end up being RQ^2=360

So 17.9^2=360??

Also, I really need help with 58. I know the answer but I need help solving it to get the same answer (5/2 cm.^2)

RainbowPanda  Apr 24, 2018
 #8
avatar+17223 
+1

SHould be 320......not 360

ElectricPavlov  Apr 24, 2018
 #9
avatar+2442 
0

oh geez sorry, that's what I meant lol

RainbowPanda  Apr 24, 2018
 #4
avatar+972 
+2

Since the perimeter of rectangle ABCD is 60 and has a length of 20, the width is:

 

\((60-(20\cdot2))\div2=10\)

 

Since they are similar, we can set the equation:

 

\(\frac{20}{32}=\frac{10}{x}\)

 

Solving for x, we have 

 

x = 16

 

Since we know the width and the length, we know the area = 16 * 32 = 512

 

The answer you are looking for is 512.

 

I hope this helped,

 

gavin

 Apr 24, 2018
 #6
avatar+2442 
0

Omg this whole time I thought the answer said 5/2 (cuz my teacher gave me answers but I had to solve the problem to get the answer) and it says 512 I was looking at the wrong problem XDD ty

RainbowPanda  Apr 24, 2018
 #10
avatar+972 
+2

Or maybe the fraction sign looks like a 1 :)

 

5 / 2

GYanggg  Apr 24, 2018
 #12
avatar+2442 
0

That too lol but one of the answers to a previous question was 5/2 and the way I wrote 512 looks like 5/2

RainbowPanda  Apr 24, 2018
 #5
avatar+10066 
+2

Need help with 58 and 61

 

laugh

 Apr 24, 2018
edited by Omi67  Apr 24, 2018
 #7
avatar+2442 
+1

Ty :D

RainbowPanda  Apr 24, 2018
 #11
avatar
+1

61)

 

16/RQ = RQ/20   The cos of RQS = cos of RQP.  Cross multiply

RQ^2 =16 x 20

RQ^2 = 320

RQ = Sqrt(320)

RQ =8sqrt(5)

 Apr 24, 2018
 #13
avatar+972 
+1

I do not think that is the correct answer.

 

The two RQ are not equal.

GYanggg  Apr 24, 2018
edited by GYanggg  Apr 24, 2018
 #14
avatar+2442 
+1

Ty! :D

RainbowPanda  Apr 24, 2018
 #15
avatar+2442 
+1

Not fully 

8*sqrt(5)=17.8885438=17.9

RainbowPanda  Apr 24, 2018
 #16
avatar
-1

8sqrt(5)^ - 16^2 =RS = 64

RS =Sqrt(64) = 8

 

8^2 + 4^2 = 80 =RP^2

RP^2 = 80

RP = Sqrt(80)

RP = 4sqrt(5)

 Apr 24, 2018
edited by Guest  Apr 24, 2018
 #17
avatar+2442 
0

17.9 is the correct answer

RainbowPanda  Apr 24, 2018
 #18
avatar
+1

The exact answer for RQ =8sqrt(5) =17.88854.......=17.9 - rounded to the nearest tenth, as they ask you to do.

 Apr 24, 2018
edited by Guest  Apr 24, 2018

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