sson 4 Practice Problems 1. This diagram is a straightedge and compass construction. A is the center of one circle, and B is the center of the other. Explain how we know triangle ABC is equilateral. bauow - 16 2. A, B, and C are the centers of the 3 circles. How many equilateral triangles are there in this diagram? 3. This diagram is a straightedge and compass construction. A is the center of one circle, and B is the center of the other. Select all the true statements. A. AC = BC B. AC = BD C. CD = AB D. ABCD is a square. E. ABD is an equilateral triangle. F. CD = AB + AB esson 4 Practice Problems