Answer:
7.5π
Step-by-step explanation:
First we should get the entire circle's circumference with 2rπ
2 * 5 * π = 10π
Now, because whats missing is a 90° arc, which is 1/4 of the circle, we can say the the rest of it is 3/4 of the circumference.
3/4 * 10π = 7.5π
Answer:
31 1/3
Step-by-step explanation:
There are 90 teenage girls in the concert hall.
2/5 x 600 = 240
3/8 x 240 = 90
Answer: Line AC = 36
Step-by-step explanation: The first and most important clue is the fact that points B, D and F are midpoints of the triangle ACE. What this tells us is that point B divides line AC into two equal sides. Likewise points D and F. If point D divides line EC into two equal sides, then line ED equals
39/2 = 19.5
Also, triangle FED is similar to triangle AEC. Since ED is half of EC, and FE is half of AE. Therefore in triangles FED and AEC,
FD/ED = AC/EC
18/19.5 = AC/39
By cross multiplication we now have
(18 x 39)/19.5 = AC
702/19.5 = AC
36 = AC
Therefore line AC = 36
