Question

all isosceles triangles are equilateral.

a. true
b. false

Explanation:

Step1: Define isosceles triangle

An isosceles triangle has at least two equal - length sides.

Step2: Define equilateral triangle

An equilateral triangle has all three sides of equal length.

Step3: Analyze the statement

Not all isosceles triangles have three equal - length sides. There are isosceles triangles with only two equal sides.

Answer:

B. False