What is the missing angle of the blue triangle using A^2 + B^2 = C^2

The vertices of a rectangle are given in the columns of the matrix . if is found to perform a transformation, what are the coordinates of the transformed rectangle? (0, 0), (0, –3), (–3, –3), (–3, 0) (0, 0), (0, 3), (3, 3), (3, 0) (0, 0), (0, 3), (–3, –3), (–3, 0) (0, 0), (0, 3), (–3, 3), (–3, 0)

Select the lengths in centimeters that would form a right triangle

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°