Grade 7 Math Mixed Review Worksheet - onlinemath4all In triangle ABC, BC = 4 and CA = 6. If the perimeter of the triangle is 4 times the length of side BC, what will be the length of AB? (A) 8 (B) 6 (C) 7 Need solution Question 4 : David is 7 feet and 5 inches tall. His basketball hoop is 10 feet from ground.