Question

7th 30 30 find cosa b a 16 34 c 30/15 16/34 30/16 30/34 dec 1

Explanation:

Step1: Recall the cosine formula

\(\cos A=\frac{\text{adjacent side}}{\text{hypotenuse}}\)

Step2: Identify sides

In right - triangle \(ABC\) with right - angle at \(B\), for angle \(A\), the adjacent side to angle \(A\) is \(AB = 30\) and the hypotenuse is \(AC=34\)

Step3: Calculate \(\cos A\)

\(\cos A=\frac{AB}{AC}=\frac{30}{34}\)

Answer:

\(\frac{30}{34}\)