The perimeters of similar triangles are in the same ratio as the corresponding sides.
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Which matrix can be multiplied to the left of a vector matrix to get a new vector matrix ?

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)