Cos20=opp/hyp
cos20=19/x
x=19/cos20
Answer:
Step-by-step explanation:
the answer is six you divide 18 by three and boom
Your answer is 18 because your dividing
Answer:
i think 1, 3, 4 for rational
the rest for irrational
Step-by-step explanation:
i'm sorry if it's wrong >_<
Answer: The answer is 314.28 cm² (approx.).
Step-by-step explanation: Given that an engineer is going to install a new water pipe. The diameter of this circular pipe is, d = 20 cm.
We need to find the area 'A' of the circular cross-section of the pipe.
Given, diameter of the circular section is

So, the radius of the circular cross-section will be

Therefore, cross-sectional area of the pipe is

Thus, the answer is 314.28 cm² (approx.).