Question

in triangle ABC, shown below, find the measure of angle A. Round to the nearer degree. Use any appropriate trigonometric ratio.

A. 22
B. 23
C. 67
D. 68

Answer 1

okay....so you have some angle you dont know....but you have all sides to use....

so.....you know how you would use sin....to find a side length?
here
you would use sin^-1 to find the angle measurement

you dont even have to use sin either....you can use cos...or tan .....pick which one you would like to use here :)

Answer 2

okay can u give me the equation to use?

Answer 3

HELLO?

Answer 4

oh sorry...never said I had a new notification

okay so we can use sin^-1 here

sin is opposite / hypotenuse right??

so from angle A the opposite is 5! and the hypotenuse is 13

so you would want to do

arcsin (same thing as sin^-1) of 5/13

which comes out to?

Answer 5

so whats my equation:)

Answer 6

so i can type it out on the calculator

Answer 7

so you would do

sin^-1 (5/13)

Answer 8

p.s***make sure your calculator is in DEGREE mode! lol VERY COMMON MISTAKE

Answer 9

dang I have a regular calculator, what did u get sorry?

Answer 10

lol no problem...I got 22.6198.....

so rounded to the nearest degree would be?