# Thread: Expressing angles

1. ## Expressing angles

Hi, I have this really annoying problem in Geometry..

There's this triangle:

Data:

BD is perpendicular to AC(Both sides of <D form 90 degrees)

ABC is a right triangle, <B=90

<A = alpha

The question is:

Express using alpha the following angles:
1. <C
2. <DBC
3. <DBA
For example is alpha was <C + <C then you'd express using alpha the angle <C by writing <C = 1/2alpha

This should be solved using very basic right triangle rules, but I don't know what to do.

I need this for tomorrow's homework =/

Thanks to all helpers

2. Originally Posted by thejack
Hi, There's this triangle:

Data:
BD is perpendicular to AC(Both sides of <D form 90 degrees)
ABC is a right triangle, <B=90
<A = alpha
The question is:
Express using alpha the following angles:
1. <C
2. <DBC
3. <DBA
You should understand that this is not a homework service nor is it a tutorial service. Please either post some of your own work on this problem or explain what you do not understand about the question.
Here is some help on #1
$m\left( {\angle C} \right) = 90 - \alpha$. WHY?

3. Originally Posted by Plato
You should understand that this is not a homework service nor is it a tutorial service. Please either post some of your own work on this problem or explain what you do not understand about the question.
Here is some help on #1
$m\left( {\angle C} \right) = 90 - \alpha$. WHY?
I need this to prepare for my test and I don't get anything