Question

directions: classify each triangle by its angles and sides.
4.
3 mm
3 mm
3 mm
by angles
select
by sides
select

Explanation:

Step1: Classify by sides

A triangle with all three sides equal is an equilateral triangle. Here, all sides are \(3\) mm.

Step2: Classify by angles

In an equilateral triangle, all angles are equal. Using the angle - sum property of a triangle (\(A + B + C=180^{\circ}\)), if \(A = B = C\), then \(A=B = C = 60^{\circ}\). A triangle with all angles less than \(90^{\circ}\) is an acute - angled triangle.

Answer:

By Angles: Acute - angled triangle; By Sides: Equilateral triangle