f the measure of angle BCD is 67.4°, the measure of angle ABC is °. If the length of base AB is 80 feet, the length of DC is feet.

Step-by-step explanation:

Given

See attachment for complete question

Required

and side length DC

 Calculating

First, calculate

--- angles in a triang;e

So:

Collect like terms

So:

Calculating DC

First, calculate EC using Pythagoras theorem.

Collect like terms

Take square roots

Length DC is:

Where

So:

a is the correct