Answer:
Step-by-step explanation:
Given
Two sides of triangle of sides 5 ft and 7 ft
and angle between them is increasing at a rate of 0.9 radians per second
let 
is the angle between them thus
Area of triangle when two sides and angle between them is given
Differentiate w.r.t time
at 
6 is the height for the parallelogram, <span />
The sum of angles in a triangle is 180°.
.. (x +40) +(3x -17) +(2x -5) = 180 . . . . . angle relationship in a triangle
.. 6x +18 = 180 . . . . . . . . . . . . . . . . . . . .simplify the sum
.. x +3 = 30 . . . . . . . . . . . . . . . . . . . . . . .divide by 6; then subtract 3
.. x = 27
_____
Check:
The angles are 67°, 64°, 49°, which add to 180°.
Then add 6/16 * 112 = 42 striped and
10/16 * 112 = 70 white
