The question has two similar triangles. The triangles are isosceles.
In order for us to get the length of the sides of the other triangle, we can use ratio and proportion.
Triangle 1
side lengths = 24 mm
base length = 16 mm
Triangle 2
side lengths = ?
<span>base length = 11 mm
</span>
24 : 16 = X : 11
24 / 16 = X / 11
16X = 264
X = 16.5 mm
So the length of the equal-length side of the other triangle.
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D because it combines the sentences correctly. I think, I'm puzzled between d and a but I really do think its d. :) Hope this helps!