Ask Question
26 June, 12:21

In △ABC, a=34, b=18, and c=17. Find m∠A.

A. 14.1

B. 132.6

C. 152.5

D. 101.5

+5
Answers (1)
  1. 26 June, 15:25
    0
    C. m < A = 152.5 degrees.

    Step-by-step explanation:

    Use the Cosine Rule:

    a^2 = b^2 + c^2 - 2. b. c. cos A

    34^2 = 18^2 + 17^2 - 2.18.17 cos A

    2.18.17 cos A = 18^2 + 17^2 - 34^2

    cos A = (18^2 + 17^2 - 34^2) / (2.18.17)

    cos A = - 0.88725

    m < A = 152.5 degrees.
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “In △ABC, a=34, b=18, and c=17. Find m∠A. A. 14.1 B. 132.6 C. 152.5 D. 101.5 ...” in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers