Question

Determine the measure

Answer 1

∠ D ≈ 31.0°

Explanation:

using the tangent ratio in the right triangle

tan D =
`(opposite)/(adjacent)` =
`(EF)/(DE)` =
`(9)/(15)` , then

∠ D =
`tan^(-1)` (
`(9)/(15)` ) ≈ 31.0° ( to the nearest tenth )