In Exercises 15 to 18 describe the triangle AXYZ not shown as scalene isosceles or equilateral Also is the triangle acute right or obtuse 15 m X 43 and m Y 47 16 m X 60 and LY LZ 17 m X mZY 40 18 m X 70 and m Y 40 19 Two of the sides of an isosceles triangle have lengths of 10 cm and 4 cm Which length must be the length of the base