how do you find the area of a trapezoid?

- anonymous

how do you find the area of a trapezoid?

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- schrodinger

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- dumbcow

general formula
h=height
b1=bottom base length
b2=top base length
A = (1/2)*h*(b1+b2)

- anonymous

so I don't need to worry about the side length and degree that they gave me?

- dumbcow

for area no as long as you have all the other information you need

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## More answers

- anonymous

I don't have the height but have a side length

- dumbcow

set up right triangle by drawing line straight down from where side meets top

- dumbcow

which angle did they give you, top or bottom?

- 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

ok to find height you have use trig
sin65 =opposite/hypotenuse = h/14
h = 14*sin65

- anonymous

which is about 12.7
now I just plug it in

- anonymous

A=.5(12.7(12+25))
A= about 235

- anonymous

thanks

- dumbcow

good ;)

- anonymous

wait lol my teacher showed me how to do this next one but I forgot it

- anonymous

tanx=-1
given that 0 degrees is less than or equal to x which is less than or equal to 360 degrees

- 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

we are solving for x

- dumbcow

thats what i am assuming

- anonymous

yes

- dumbcow

do you have a unit circle?

- dumbcow

this is for w/out calculator
if you are allowed to use calculator
you could enter arctan(-1)

- anonymous

I'm using a TI-83 a way old version of graphing calcs

- anonymous

and no unit circle

- dumbcow

haha hey thats what i use
ok what do you get when you enter arctan(-1)

- anonymous

and exactly how am I supposed to enter arctan(-1)? lol

- dumbcow

theres a tan^-1 above the tan button

- anonymous

the inverse of tan is = arctan(-1)?

- dumbcow

yes sorry inverse tan is also called arctan

- anonymous

-45?

- dumbcow

good but 0

- anonymous

is there no value?

- 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

ok got it thanks:)

- dumbcow

i see you

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