Question

Find the measurement of ∠D and ∠C

Answer 1

∠D = 125° and ∠C = 55°

Explanation:

We should first solve for variable x, which should give us angle C, and then solve for angle D.

• 
  `3x+15=180`
• 
  `3x=165`
• 
  `x=55`°

Thus ∠C = 55°

Knowing that supplementary angles add to 180°, we set up the equation:

• 
  `55+D=180`
• 
  `D=125`°

Thus ∠D = 125°