MATH SOLVE

4 months ago

Q:
# Find the missing side or angle. Round to the nearest tenth.

Accepted Solution

A:

Cosine law

a^2 = b^2 + c^2 - 2(b)(c)cosA

a^2 = 2^2 + 4^2 - 2(2)(4)cos78

a = 4.08

a = 4.1

a^2 = b^2 + c^2 - 2(b)(c)cosA

a^2 = 2^2 + 4^2 - 2(2)(4)cos78

a = 4.08

a = 4.1