### Home > INT2 > Chapter 12 > Lesson 12.2.3 > Problem 12-116

12-116.

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*ABC*has a right angle at*B*. If*m*∠*A*= 42º and*BC*= 7 mm, what is the approximate length of*AC*? Homework Help ✎A. 9.4 mm

B. 10.5 mm

C. 7.8 mm

D. 4.7 mm

What trig ratio can you use to solve for *AC*?

(b) 10.5 mm