hHRS8801
28.06.2019 •
Mathematics
You are standing at point b. point b is 21 feet from the center of the circular water storage tank and 20 feet from point a. \frac{ }{ab} a b is tangent to \odot ⊙ o at a. find the radius of the tank.
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Ответ:
r = 6.40 feet
Step-by-step explanation:
Given line AB is tangent to circle O at point A, this means ∡OAB = 90°
Hence this is a right angle triangle and we can use the Pythagorean theorem.
r² + 20² = 21²
r² = 21² - 20²
r² = 441 - 400
r² = 41
r = √41 = 6.40 feet
Ответ:
0.9p
explain:
the original price is the item is 1p. 10% of 1 is 0.9. thus, 0.9p represents an item that’s been marked down by 10%.