Could anybody please help with an angle calculation?

 

Looking at ordering a metal flashing between the main slate roof (45 degree pitch) and the lean to metal roof (15 degree pitch).

 

What would be the method to calculate the angle where the two roof pitches meet? Hopefully, somebody can help, or I might need to dust off the old GCSE maths books!

 

The image hasn't copied across well but this will help show what I'm trying to calculate.

 

Off the top of my head: 180º - (45º - 15º) = 150º ?

 

 

Edited July 31, 20188 yr by Dreadnaught

150⁰ included angle I make it:

 

Crap picture done on my phone....but along line of what others are saying.

Quick check ... should be 5 sides of the new 12 side pound coin, or something similar, when centred on the meeting point on the plan.

 

Edited July 31, 20188 yr by Ferdinand

Thanks very much guys, much appreciated. Memories of compasses and protractors are coming back to me now. 

 

I'll check with pound coin as suggested @Ferdinand

 

2 hours ago, Thedreamer said:

Thanks very much guys, much appreciated. Memories of compasses and protractors are coming back to me now. 

 

I'll check with pound coin as suggested @Ferdinand

 

 

I was racking my brain for something a little bigger to make it a bit easier, and I guess you could use a clock or a clock face.

 

Any 5 hours will be 150 degrees.

 

Not sufficent for accuracy, but probably enough to show up if it is way off.

Edited July 31, 20188 yr by Ferdinand
Throw -> Show. A sickening typo.