Question

solve for the value of r. answer attempt 1 out of 3 $r=$ submit answer

Explanation:

Step1: Set up the equation

Since the sum of the angles is \(90^{\circ}\), we have \(9r + 2+70 = 90\).

Step2: Simplify the left - hand side

Combine like terms: \(9r+72 = 90\).

Step3: Isolate the term with \(r\)

Subtract \(72\) from both sides: \(9r=90 - 72\), so \(9r = 18\).

Step4: Solve for \(r\)

Divide both sides by \(9\): \(r=\frac{18}{9}\).

Answer:

\(r = 2\)