In matrix multiplication, the number of columns in the 1st matrix is equal to the number of rows in the 2nd matrix.
Multiply each element of the 1st row of the 1st matrix by the corresponding element of the 1st column of the 2nd matrix. Then add these products to obtain the element in the 1st row, 1st column of the product matrix.
The remaining elements of the product matrix are found in the same way.
Simplify each element by multiplying the individual terms.
In an isosceles triangle two angles will be equal So, if 50 is one of the equal angles then the angles will be (50,50,80) Otherwise if 50 is the non-equal angle then the angles will be (50,65,65)