The coordinate grid below shows a sketch of a silver pendant. 
Each unit on the grid represents 10 milimeters.
a. What is the shortest distance between point R and ?
b. How many milimeters longer is  than ?
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50 points and will mark brainlest if you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking: