Question

are these shapes similar?

Explanation:

Step1: Check ratio of corresponding sides

For the first - shape with side lengths 30 mm, 35 mm, 40 mm, 30 mm and the second - shape with side lengths 18 mm, 24 mm, 21 mm, 18 mm. Calculate the ratios of corresponding sides. Let's assume the sides are paired in order.
The ratio of the first pair of sides: $\frac{30}{18}=\frac{5}{3}$
The ratio of the second pair of sides: $\frac{35}{24}$
Since $\frac{5}{3}
eq\frac{35}{24}$, the ratios of corresponding sides are not equal.

Answer:

no