Answer is <span>3:5=12:20
3x4 = 12
5x4 = 20
so
</span><span>3:5=12:20</span>
The age would increase by 15 years that is, x+15
The sum of the lengths of any two sides of a triangle must be greater than the length of the third side (or else, it can't be a closed polygon). Since we know that the two sides in question are both of the same length in this case (since the triangle isosceles), their individual lengths must be greater than 25/2 = 12.5.
An acute angle is an angle less than 90 degrees. (smaller angle)
A right angle is exactly 90 degrees. (right angle)
An obtuse angle is over 90 degrees. (larger angle)
A reflex angle is any angle of 180 degrees. (largest angle)
You wouldn't *really* need a protractor to complete your homework; you could guesstimate.
I hope this helps!
D over dx (x sin^2(x)) = sin(x) (sin(x) + 2 x cos(x))
