Question

Help?

Answer 1

what's the question?

Answer 2

wait can you see the picture?

Answer 3

yes... it's a right triangle (30-60-90)

Answer 4

The question is to calculate the area

Answer 5

Sorry i thought it was in the picture

Answer 6

do you know the area for a triangle?

Answer 7

is it b*h?

Answer 8

1/2*B*H?

Answer 9

yep... that second one..

Answer 10

so we already have 11 as the base correct? now we need the length of RS, which will be your height.

Answer 11

but i dont know the height...

Answer 12

yes...

Answer 13

did you need to use trig or some specific method? because there are many different ways to do this.

Answer 14

No any method...

Answer 15

ok... we'll use trig.. that should be the easiest...

notice that the hypotenuse of the triangle is 22.. do you know why?

Answer 16

no...

Answer 17

11*2?

Answer 18

as i mentioned before, this is a 30-60-90 triangle.... it has SPECIAL properties... one is that the shortest side is always HALF of the hypothenuse.. yes, you're correct 11*2..

Answer 19

right right...

Answer 20

since the hypotenuse is 22, we can use trig to find RS:

\(\huge cos(30)=\frac{RS}{22} \)

solve this equation to find RS, your height. then plug that answer into the area formula.

Answer 21

RS=11?

Answer 22

no.... what's cos(30 degrees) ???

Answer 23

?

Answer 24

.86?

Answer 25

cosine of 30 degrees is \(\large \frac{\sqrt3}{2} \approx .86 \)

yes, you're right....

Answer 26

okay...

Answer 27

so now...

Answer 28

so what u got for RS?

Answer 29

im sorry im lost....

Answer 30

\(\large cos(30)=\frac{RS}{22} \implies 22*cos(30)=RS \)
use your calculator to find RS.

Answer 31

.039?

Answer 32

no...
cos(30) = .86 so
RS = 22*0.86 = ???

Answer 33

18.92

Answer 34

@Hero can you help please???

Answer 35

ok.. that's RS, your height..
now plug that into your area formula for the trangle and you're done...

Answer 36

thanks soo much!:)