Triangle A has side lengths of 14 in, 12 in, and 6 in. Triangle B has side lengths of 7 in, 6 in, and 3 in.
Which shows the proportions written correctly?

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol