Sheet # 379
Name_________________________Date:_____________
Show your work.
1) If ABC is an equilateral triangle with a perimeter of 21 cm, what is the perimeter and area of square BCDE?
2) In the above picture, find the angle ABE.
Answers for sheet # 379.
1) Side of the equilateral triangle is 21/3 = 7 cm
Area = 49 sq cm
Perimeter = 28 cm
2) Angle ABE = Angle ABC + CBE
= 60 degrees + 90 degrees
= 150 degrees
Since ABC is an equilateral triangle, each angle is 60 degrees.