Question

all equilateral triangles are acute and isosceles.
a. true
b. false

Explanation:

Step1: Recall triangle definitions

An equilateral triangle has all angles equal to 60°. Since 60° < 90°, it is acute.

Step2: Recall isosceles - triangle definition

An isosceles triangle has at least two equal - length sides. An equilateral triangle has three equal - length sides, so it also meets the criteria for an isosceles triangle.

Answer:

A. True