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SCORPION-xisa [38]
3 years ago
5

Will mark BRAINLIEST to correct answer! Please help, this has to be correct. Thanks!

Mathematics
2 answers:
disa [49]3 years ago
7 0
The water pipe is a cylinder. The question asks for the circular cross section of the pipe. We know the diameter is 20 cm. The radius is half of the diameter, so it is 10 cm. The area of the circular cross section is A= \pi r^2 We plug in r in our equation to get 
A=\pi (10)^2=100 \pi
100 \pi cm^2 is our answer.
pogonyaev3 years ago
4 0
The answer would be 314.16 square cm
Hope this helps! :)
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Consider angle θ in Quadrant II, where sinθ = 4/5 . What is the value of cosθ?
Kay [80]

Answer:

3/5

Step-by-step explanation:

sin theta=opposite/hypotenuse

4/5=opposite/hypotenuse

therefore opposite=4 and hypotenuse=5

for adjacent

using pythagoras theorem

a^2+b^2=c^2

opposite^2 + adjacent^2 =hypotenuse^2

4^2 + adjacent^2 =5^2

16 + adjacent^2 =25

adjacent^2 =25-16

adjacent =\sqrt{9

adjacent=3

cos theta=adjacent/hypotenuse

=3/5

therefore the value of cos theta is 3/5

8 0
3 years ago
PLEASE HELP I WILL GIVE BRAINLIST IF ITS RIGHT
kogti [31]

Answer:

49/4 inches

Step-by-step explanation:

Inches below ground=  3 1/2 inches

Plant's full  height=15 3/4 inches

Height above ground = 15 3/4 inches -3 1/2 inches

63/4 - 7/2

63-14/4

49/4 inches

5 0
2 years ago
Read 2 more answers
What is the perimeter and area of 18 12 13
Greeley [361]

Answer:

p=43 a=78

Step-by-step explanation:

im assuming this is a triangle

perimeter is 18+12+13=43

area is 12*13=156 then divide by 2 =78

3 0
3 years ago
Read 2 more answers
PLEASE HELPPPPPPPPPPPPPP
mart [117]

Answer:

None of these can be triangles.

Step-by-step explanation:

All triangles’ side lengths must follow this pattern - the two shortest sides must be GREATER than the longest when added together. 6 + 4 < 10, so this isn’t a triangle. 3 + 8 = 11, so this isn’t a triangle. 8.4 + 7.7 < 16.6, so this isn’t a triangle. Lastly, 4 + 3 < 16, so this isn’t a triangle. Hope this is accurate & helpful! Best of luck.

6 0
2 years ago
HELP!! Please show and justify each step to help me understand!
azamat
The answer might be 18x^2+19x+35
5 0
3 years ago
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