Answer:
Step-by-step explanation:
Sin(30) / X = Sin(45) / 12
use algebra to isolate X
1 / X = [ Sin(45) / 12 ] / Sin(30)
flip both sides
X = Sin(30) / [Sin(45) /12 ]
invert the denominator on the right side
X = Sin(30) * 12/ Sin(45)
Do you know what Sin(30) is off the top of your head?
and also Sin(45) ?
these are worth remembering... and you can b/c they are just
sin(0) = 0/2
sin(30) = 1 / 2
sin(45) =
/2
sin(60)=
/ 2
sin(90) =
/ 2 (aka 1)
note the numerators just counts up 0, 1, 2, 3, 4 :)
Cos works the same way but counts from 90° back to 0 but exactly like sin other wise, hence why Cos and Sin both =
/2 at 45 °
anyway
X = 1 / 2 * 12/
/2
X = 3![\sqrt{2}](https://tex.z-dn.net/?f=%5Csqrt%7B2%7D)
A=3
B= 2
:) nice , huh
This is an isosceles triangle: a triangle with two sides equals.
Therefore:
side BA=side CA
8x-4=5x+11
8x-5x=11+4
3x=15
x=15/3
x=5
length of side BC=4x-2=4(5)-2=20-2=18.
The lenght of side BC is 18 units of lenth.
We want the seconds to be converted in hours to work out the speed, so:
7200Seconds /60 / 60 =2 Hours
150 / 2 = 75
Therefore the car travels at 75kmh.
It is a
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