30, 32, and 34 Please! I WILL GIVE BRAINLIEST

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Select the lengths in centimeters that would form a right triangle