Find the value of both missing side ( not just y)

y = 10(√3)/3

unnamed side = 5(√3)/3

Side ratios in a 30°-60°-90° triangle are 1 : √3 : 2.

Multiplying these by 5/√3 gives ...

... unnamed side : 5 : y = 5/√3 : 5 : 10/√3

Then ...

... unnamed side = 5/√3 = 5(√3)/3

... y = 10/√3 = 10(√3)/3

the forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?