ΔXYZ is a right triangle with right angle X, sin Y = m, and cos Y = k.
What is cos Z − sin Z ?

k - m

2m

k + m

m - k

The answer is d 18ft

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's