Triangle JKL, where KL = 8 cm, JK = 6 cm and <JKL = 90°

Answer 1

so it is twice a 3,4,5 right triangle
sides are 2*3 , 2*4 and hypotenuse is therefore 10
make absolutely certain that
10^2 = 6^2 + 8^2
then what else is there ?
cos JLK = 0.8
third angle is 90 - that
etc.