Identifying Triangles by Sides
Identify equilateral, isosceles, and scalene triangles.
Item 1326
Identifying Triangles by Sides
Triangles can be classified by their sides. A triangle with all sides of equal length is an
equilateral triangle. A triangle that has two sides with the same length is an isosceles
triangle. A triangle where all sides are different lengths is a scalene triangle. Review the
triangles below and select the correct answer.
4in
3in
3in
3in
3in
3in
Ο equilateral triangle Ο isosceles triangle
Ο equilateral triangle Ο isosceles triangle
Ο scalene triangle
Ο scalene triangle
4in
3in
4in
4in
1in
3in
Ο equilateral triangle Ο isosceles triangle
Ο equilateral triangle Ο isosceles triangle
Ο scalene triangle
Ο scalene triangle
5in
4in
6in
3in
8in
3in
Ο equilateral triangle Ο isosceles triangle
Ο equilateral triangle Ο isosceles triangle
Ο scalene triangle
Ο scalene triangle
4in
4in
4in
Ο equilateral triangle Ο isosceles triangle
Ο scalene triangle
Copyright ©2011 T. Smith Publishing. All rights reserved.
9 An isosceles triangle can
be a right triangle.
9 All three angles of an
equilateral triangle are
60°
www.tlsbooks.com
Graphic ©2011 JupiterImages Corp.
Identifying Triangles Answer Key
Identify equilateral, isosceles, and scalene triangles.
Item 1326
Identifying Triangles by Sides
Triangles can be classified by their sides. A triangle with all sides of equal length is an
equilateral triangle. A triangle that has two sides with the same length is an isosceles
triangle. A triangle where all sides are different lengths is a scalene triangle. Review the
triangles below and select the correct answer.
4in
3in
3in
3in
3in
3in
Ο equilateral triangle ● isosceles triangle
● equilateral triangle Ο isosceles triangle
Ο scalene triangle
Ο scalene triangle
4in
3in
4in
4in
1in
3in
Ο equilateral triangle Ο isosceles triangle
Ο equilateral triangle ● isosceles triangle
● scalene triangle
Ο scalene triangle
5in
4in
6in
3in
8in
3in
Ο equilateral triangle ● isosceles triangle
Ο equilateral triangle Ο isosceles triangle
Ο scalene triangle
● scalene triangle
4in
4in
4in
● equilateral triangle Ο isosceles triangle
Ο scalene triangle
Copyright ©2011 T. Smith Publishing. All rights reserved.
9 An isosceles triangle can
be a right triangle.
9 All three angles of an
equilateral triangle are
60°
www.tlsbooks.com
Graphic ©2011 JupiterImages Corp.