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equilateral triangle problem beginner

 
 
Reply Tue 8 Dec, 2020 05:00 pm
a equilateral triangle with the sides 5cm and the area 7,5cm^2

what is the lenght of unkown side?

b * h = 15 cm^2
b*h/b = h
h = 3 cm
pythagoras gives us z = 4
and short side 1 cm

x = 5^2 + 1^2 = 10
root 10 ~ 3,2

x = 3,2

Is there similar problems like this in the beginner SAT? Very good example right? How would you explain this problem?
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Type: Question • Score: 2 • Views: 641 • Replies: 6
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ekename
 
  1  
Reply Tue 8 Dec, 2020 09:39 pm
@TooFriendly112,
If you were told that the triangle has at least two identical sides equal to 5 (isosceles) then
[(1/2)b]^2 + h^2 = 25
(1/2)bh = 15/2
Substitute h into the first equation
Solve the quadratic, and b = 5 or 45
Or simply observe that an equilateral triangle has three equal sides.
There is no unknown side and the base = 5

0 Replies
 
roger
 
  0  
Reply Tue 8 Dec, 2020 10:05 pm
@TooFriendly112,
TooFriendly112 wrote:

a equilateral triangle with the sides 5cm and the area 7,5cm^2
What definition of 'equilateral' are you using?
izzythepush
 
  0  
Reply Wed 9 Dec, 2020 09:07 am
@roger,
I think they’re confusing equilateral and isosceles.
maxdancona
 
  1  
Reply Wed 9 Dec, 2020 10:29 am
@izzythepush,
Don't be obtuse
roger
 
  0  
Reply Wed 9 Dec, 2020 12:34 pm
@maxdancona,
I think he's right.

Oh, a pun!
maxdancona
 
  2  
Reply Wed 9 Dec, 2020 01:57 pm
@roger,
Yes, and there were 9 others. I am trying to find some play on words that will get Izzy to express his approval of me. But, sadly...

... No pun in ten did
0 Replies
 
 

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