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
A=3
B= 2
:) nice , huh
0.31 rounded to the nearest tenth would be 0.3
This Chart should help you in the future:
Answer: 4 inches
Step-by-step explanation:
Well you know that a foot is 12 inches. We also know that when it is asking to convert 1/3 of a foot to inches that it is asking us to give one of three of the same numbers that add up to equal 12. So it is asking us to divide.
Question: Convert 1/3 foot to inches. 1 ft. = 12 in.
1/3 × 12/1 = 12/3
Which is the same as if you wrote it like:
12 ÷ 3
12 ÷ 3 = 4
So to convert would be:
1/3 ft. = 4 in.