Renaissance painters were influenced by a shading technique known as chiaroscuro, first introduced by which of the following?
a byzantine painter
an islamic painter
a greek painter
a spanish painter

The correct answer is A Greek painter

There are evidences that Greak and Roman artists used the chiaroscuro technique. Reviving ancient Greco-Roman culture the idea of humanism was undoubtedly the engine of this movement and became the very spirit of the Renaissance. It is a deliberate return, which proposed the resurrection of the past, now considered as a source of inspiration and model of civilization.  

although the crusades failed to capture jerusalem, they had several major impacts on western europe. they increased the authority of the king: sometimes nobles died in battle without leaving an heir in which case the king got their land. kings passed taxes to pay for the crusades.

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69