Answer:
Step-by-step explanation:
APB is a straight line.
Using liner pair(sum of angles on straight line is 180 degree)
But 
In triangle FPD, FP=DP (radius of same circle.
So, triangle FPD would be isosceles triangle. FD is base of triangle.
PE is perpendicular to FD.
As we know angle bisector of isosceles triangle make perpendicular to base.
So, line PE bisect angle FPD.
As we found above 
So, 
Let c represent the speed of the current.
time = distance / speed
total time = time going upriver + time going downriver
2 2/3 = 6/(9 -c) + 6/c
(8/3)(c)(9 -c) = 6c +6(9 -c)
(8/3)c^2 -24c +54 = 0
c = (24 ± √((-24)^2 -4(8/3)(54)))/(2*8/3)
.. = (3/16)(24)
c = 4.5
The speed of the river's current is 4.5 km/h.
Answer:
D. 70°
Step-by-step explanation:
the sum of the unknown angle and 110° is 180 °
so, let the unknown angle be x
x+110 = 180
x = 180-110
x = 70°
－81＝3(5－4r)
27＝－(5－4r)
27＝－5＋4r
－4r＝－5－27
－4r＝－32
r＝8
Hope my answer helped u :)
Answer:
um what???????
Step-by-step explanation:
