use a ruler and a pair of compass construct a triangle 6cm 5cm 7cm and the degree 45

Answer 1

it's easy to construct a 45° angle -- construct a 90° angle and bisect it.

For the 5-6-7 triangle, draw the side of 7, and then a circle at each end, of radius 5 and 6. Where the circles intersect is the third vertex of the triangle.