Problem
Unit 4 Practice Assessment Select all statements that are true about equilateral triangle $A B C$. a. Angles $B$ and $C$ are 60 degrees. b. $x=3 \sqrt{3}$ c. $x=6 \sqrt{3}$ d. Triangle $A B D$ is congruent to triangle $A C D$. e. $B D$ and $C D$ are both 3 units long. f. The area of triangle $A B C$ is 18 square units. g. The area of triangle $A B C$ is $18 \sqrt{3}$ square units. h. The area of triangle $A B C$ is 36 square units.
Solution
Step 1 ：Analyze each statement for equilateral triangle ABC with side length x
Step 2 ：Only statement a is true: \(\boxed{\text{Angles B and C are 60 degrees}}\)
