30°, 70°, and 80°. It is an acute-angled triangle. Explanation: The ratio of the measures of ∠s in Δ is 3:7:8. So, let us suppose that the measures are, 3k, 7k, 8k. Evidently, their sum is 180°.
3k+7k+8k=180 18k=180 k= 10
Hence, the measures are, 30°, 70°, and 80°. As all the angles are acute, so is the triangle.
