anonymous
  • anonymous
how do you find the area of a trapezoid?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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dumbcow
  • dumbcow
general formula h=height b1=bottom base length b2=top base length A = (1/2)*h*(b1+b2)
anonymous
  • anonymous
so I don't need to worry about the side length and degree that they gave me?
dumbcow
  • dumbcow
for area no as long as you have all the other information you need

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anonymous
  • anonymous
I don't have the height but have a side length
dumbcow
  • dumbcow
set up right triangle by drawing line straight down from where side meets top
dumbcow
  • dumbcow
which angle did they give you, top or bottom?
anonymous
  • anonymous
they gave me bottom so instead of hte right angle being 90 it's 65 then the angle opposite is 90 and top is 25 the hypotenuse is 14in
dumbcow
  • dumbcow
ok to find height you have use trig sin65 =opposite/hypotenuse = h/14 h = 14*sin65
anonymous
  • anonymous
which is about 12.7 now I just plug it in
anonymous
  • anonymous
A=.5(12.7(12+25)) A= about 235
anonymous
  • anonymous
thanks
dumbcow
  • dumbcow
good ;)
anonymous
  • anonymous
wait lol my teacher showed me how to do this next one but I forgot it
anonymous
  • anonymous
tanx=-1 given that 0 degrees is less than or equal to x which is less than or equal to 360 degrees
dumbcow
  • dumbcow
tanx = sinx/cosx tanx = -1 so sinx/cosx = -1 multiply cosx on both sides sinx = -cosx for what x on unit circle is sin opposite of cos
anonymous
  • anonymous
we are solving for x
dumbcow
  • dumbcow
thats what i am assuming
anonymous
  • anonymous
yes
dumbcow
  • dumbcow
do you have a unit circle?
dumbcow
  • dumbcow
this is for w/out calculator if you are allowed to use calculator you could enter arctan(-1)
anonymous
  • anonymous
I'm using a TI-83 a way old version of graphing calcs
anonymous
  • anonymous
and no unit circle
dumbcow
  • dumbcow
haha hey thats what i use ok what do you get when you enter arctan(-1)
anonymous
  • anonymous
and exactly how am I supposed to enter arctan(-1)? lol
dumbcow
  • dumbcow
theres a tan^-1 above the tan button
anonymous
  • anonymous
the inverse of tan is = arctan(-1)?
dumbcow
  • dumbcow
yes sorry inverse tan is also called arctan
anonymous
  • anonymous
-45?
dumbcow
  • dumbcow
good but 0
anonymous
  • anonymous
is there no value?
dumbcow
  • dumbcow
neg angle just refers to direction 315 degrees in positive direction is same as 45 degrees in negative direction think of a circle
anonymous
  • anonymous
ok got it thanks:)
dumbcow
  • dumbcow
i see you

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