Triangle A B C has a right angle at B. Point D is the foot of the altitude from B, A D=3, and D C=4. What is the area of \triangle A B C ?
Answer Choices
A. 4 \sqrt{3}
B. 7 \sqrt{3}
C. 21
D. 14 \sqrt{3}
E. 42
Triangle A B C has a right angle at B. Point D is the foot of the altitude from B, A D=3, and D C=4. What is the area of \triangle A B C ?
Answer Choices
A. 4 \sqrt{3}
B. 7 \sqrt{3}
C. 21
D. 14 \sqrt{3}
E. 42