



 
Hi John, Suppose the two remaining sides have lengths x cm and y cm. Since the perimeter is 47 cm you know that x + y = 47  20 = 27 cm or y = 27  x cm. The triangle is a right triangle and hence you can apply Pythagoras theorem to it. This gives you a second equation in x and y. Substitute y = 27  x and solve for x. Harley  


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