Chapter 12.4, Problem 18E

To determine

To Construct: The equilateral triangle.

Explanation of Solution

Given: Sides $1.25inches$

Draw a base $AB=1.25inches$ .

With $A$ as a center and radius equal to $1.25inches$ mark an arc.

Similarly

With $B$ as a center and radius equal to $1.25inches$ mark an arc which cuts the previous arc at point $C$ .

Join $A,BandC$ .

  $ABC$ is an equilateral triangle.