Question

2 m∠d = ______ °

Explanation:

Step1: Recall triangle - angle sum property

The sum of the interior angles of a triangle is 180°. In triangle DEF, we know that ∠E = 90° and ∠F=47°. Let ∠D=x. Then x + ∠E+∠F = 180°.

Step2: Substitute the known values

Substitute ∠E = 90° and ∠F = 47° into the equation x+90° + 47°=180°.
So, x=180°-(90° + 47°).

Step3: Calculate the value of ∠D

First, calculate 90°+47° = 137°. Then, x = 180° - 137°=43°.

Answer:

43