![countrygirlbookworm2](/avatars/39138.jpg)
countrygirlbookworm2
23.02.2021 •
Mathematics
In ΔABC , angle C is a right angle.
Which statement must be true?
A.sin A = cos B
B.sin A = tan B
C.sin B = tan A
D.sin B = cos B
Solved
Show answers
More tips
- S Style and Beauty 5 Tips for Choosing the Best Ugg Boots...
- H Health and Medicine How to Treat the Flu: A Comprehensive Guide...
- H Health and Medicine Effective Ways to Treat Colic in Infants...
- C Computers and Internet IMHO: What is it, why is it important, and how to use it?...
- F Food and Cooking How to Calculate the Gender of Your Child with Blood?...
- S Style and Beauty How to Get Rid of Under Eye Bruises?...
- C Cities and Countries What time does the Metro open in Moscow?...
- W Work and Career Where can you learn to be a flight attendant?...
- H Health and Medicine What are Electronic Cigarettes? The Ultimate Guide...
- C Computers and Internet Where are passwords stored in Opera?...
Answers on questions: Mathematics
- M Mathematics 6 square root -16 + 4 square root -49...
- M Mathematics The line of best fit for this data is y = 5.3x + 23. What is the y-intercept in the line of best fit? What does the y-intercept represent in the scatter plot?...
- M Mathematics A Country’s population in 1990 was 134 million. In 2000 it was 139 million. Estimate the population in 2014 using the exponential growth formula. Round your answer to the nearest...
- M Mathematics (x-5) (3x+6) standard form...
- M Mathematics Lorelei tosses a coin 4 times. What is the probability of tossing four heads? Express as a percent. Round to the nearest tenth if necessary....
- M Mathematics QUESTION: (IN BOLDED SHOWN IN THE 2 PICTURES)...
- M Mathematics Find the area of the shaded region. Round to the nearest tenth....
- M Mathematics PLEASE HELP ASAP ! Pre calc...
- M Mathematics Which statements about this system of equations are true? Check all that apply . 2x - 7y=-13 - 2x + 11y = 1 The x-variable will be eliminated when adding the system of equations....
- M Mathematics When 36 is subtracted from the square of a number, the result is five times the number. What is the positive solution? (This is from June 2010)...
Ответ:
Choice A. sin(A) = cos(B)
============================================================
Explanation:
The rule is that sin(A) = cos(B) if and only if A+B = 90.
Note how
sin(A) = opposite/hypotenuse = BC/ABcos(B) = adjacent/hypotenuse = BC/ABSince both result in the same fraction BC/AB, this helps us see why sin(A) = cos(B). Similarly, we can find that cos(A) = sin(B).
In the diagram below, the angles A and B are complementary, meaning they add to 90 degrees. So this trick only applies to right triangles.
The side lengths can be anything you want, as long as you're dealing with a right triangle.
Ответ:
The answer is C. 4 to the 3rd power is 4*4*4. 4*4=16 and 16*4=64 so the answer is C.