Question

what is the value of c? c = □°

Explanation:

Step1: Recall triangle - angle sum property

The sum of the interior angles of a triangle is 180°. So, 42°+3c + 3c=180°.

Step2: Combine like - terms

Combine the terms with c: 42° + 6c=180°.

Step3: Isolate the term with c

Subtract 42° from both sides: 6c=180° - 42°. So, 6c = 138°.

Step4: Solve for c

Divide both sides by 6: c=\frac{138}{6}=23.

Answer:

23