Question

Could I find the two missing angle measures if I know some of the side lengths of a right triangle?

Answer 1

some means more than 1, right?

Answer 2

Yeah, I'm pretty sure

Answer 3

then with sine, cosine, tangent, you can find the angles

Answer 4

yes, by using SAS congruents and those stuff.
like.. a^2 = b^2 + c^2 -2ab Cos A

Answer 5

im not really sure how to use them to find the angles instead of the other way around

Answer 6

a^2 = b^2 + c^2 -2ab Cos A

Answer 7

But if you know it's a right triangle, you don't use the cosine law

Answer 8

Better only use a² + b² = c²

Answer 9

Got it?

Answer 10

that'll help me find the sides, but i need the angles

Answer 11

sine theta = opposite/ hypotenuse
cosine theta = adjacent / hypotenuse
tangent theta = opposite/ adjacent

Answer 12

Pythagorean theorem does not help to find angles

Answer 13

Yeah

Answer 14

so how do i use the trigonometric ratios to find the angles if i only know the right angle?

Answer 15

im still confused xD

Answer 16

then you use inverse sine/cosine/tangent

Answer 17

okay, how do i use those? im a bit new at this

Answer 18

The sum of the interior angles of a triangle are equal to 180 degree. To find the third angle of a triangle when the other two angles are known subtract the number of degrees in the other two angles from 180 degree :)

Answer 19

i understand that, but i only know the 90 degree angle

Answer 20

Let me show you the example so that you will get it better. :)

Answer 21

@sweetrascal That has nothing to do with this

Answer 22

Example: How many degrees are in the third angle of a triangle whose other two angles are 40degree and 65degree ? Answer: 180degree - 40degree -65degree = 75degree

Answer 23

i only know the 90 degree angle... that's not what im looking for

Answer 24

\[\sin \theta = \frac{1}{2}\]\[\sin^{-1}\sin \theta = \sin^{-1} \frac{1}{2} \implies \theta = \sin^{-1} \frac{1}{2}\]

Answer 25

Moneybird will help you further :)

Answer 26

hmm

Answer 27

so both sides are multiplied by the inverse sine?

Answer 28

not multiplied on your calculator there is a inverse sine buton

Answer 29

okay, i get it! thank you!