Both matrices are 1 x 4 matrices. This notation says there is 1 row and 4 columns. The number of rows must match up, as well as the number of columns, in order for matrix addition to be possible. This is so the corresponding elements pair up and add together. For instance, the 5 and -2 pair up and add together for matrices A and C.
x is the hypotenuse so it means the other ones that are adjacent and opposite and you're looking for the hypotenuse so you can do c Square equals to a square + b square
To work out the Circumference of a circle, we must o the calculation πd π x d If we fill in the information we know π x 10.4 3.14 x 10.4 (to 2 d.p.) ↓ 32.656 (units)
