How to symmetrically set up angles, triangles on business card?

Hello CorelDraw forum!

Question: How do I join triangles and squares so that they are symmetrical?

I have a customer for whom I am designing a business card. I am having to reset the business card from a scanned image.

The business card has got angles and triangles on it. Some of the angles have fills. Others do not.

I can use the Shape tool and trace the scanned image of my customer's business card. However, some of the angles are mirrored on either end of the business card. If I trace the scanned image it would be hard to get the angles right. 

Basically, can someone point me how, or give me a few pointers about how, to work with triangles? I need to join triangles together at angles and so forth so that the business card looks symmetrical.

I would appreciate any assistance.

Thanks.