Question

l k 72° 20° j

Explanation:

Step1: Recall angle - sum property of a triangle

The sum of the interior angles of a triangle is 180°. In triangle JKL, we know two angles: ∠J = 20° and ∠K=72°. Let the third - angle be ∠L.
So, ∠J+∠K + ∠L=180°.

Step2: Solve for ∠L

Substitute the known values into the equation: 20°+72°+∠L = 180°.
First, add 20° and 72°: 20 + 72=92.
The equation becomes 92°+∠L = 180°.
Then, subtract 92° from both sides: ∠L=180° - 92°.
∠L = 88°.

Answer:

88°