trig help please

[twin hazel]

help ! thanks

[wind plaza]

do you know what sine in a right triangle means? If not, you should look it up.

[twin hazel]

i just did '

where does sine come into this equation

[wind plaza]

The first line asks for sin(A) which means sine of angle A

[static narwhal]

sin(A) is the way to describe a RATIO of two numbers in a triangle

put your finger on angle A, then do:

find the side OPPOSITE that angle A

find the hypotenuse

divide those two numbers

So, in your problem, we got;

OPPOSITE = a and HYPOTENUSE = c

so sin(A) = a/c

problem is, we weren't given c

so, we got to use the pythagorean theorem

$a^2+b^2=c^2$

[analog geode]

AndJ

[static narwhal]

$7^2+4^2=c^2$

[analog geode]

AndJ

[static narwhal]

$49+16=c^2$

[analog geode]

AndJ

[static narwhal]

$65=c^2$

[analog geode]

AndJ

[static narwhal]

(did I do that correctly?)

$c=\sqrt{65}$