Find angle D if one side of equilateral triangle is 4 cm

Answer:
∠ Q = 60°
Step-by-step explanation:
given Δ QRS is equilateral
In an equilateral triangle
• the sides are congruent ( equal )
• the angles are congruent
Then
RQ = RS = QS = 4 cm
∠ Q = ∠ R = ∠ S = 60° ( 180° ÷ 3 )