How Do You Find Missing Angles in an Isosceles Triangle Using Right Triangles?

How Do You Find Missing Angles in an Isosceles Triangle Using Right Triangles?

Note:

Trying to find a missing interior angle measurement in a triangle? See if you're working with a special type of triangle such as an equilateral or isosceles triangle. If you are, that knowledge can help you. In this tutorial, see how identifying your triangle first can be very helpful in solving for that missing measurement. Take a look!

Keywords:

  • problem
  • triangle
  • isosceles
  • isosceles triangle
  • find angle
  • find missing angle
  • right angle
  • right triangle
  • congruent
  • congruent triangles
  • equal angles
  • congruent angles
  • add to 90
  • complementary
  • complementary angles
  • triangle sum theorem
  • angle
  • angles

Background Tutorials

  • Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

      • What is an Angle?What is an Angle?

      What is an Angle?

      Angles are a fundamental building block for creating all sorts of shapes! In this tutorial, learn about how an angle is formed, how to name an angle, and how an angle is measured. Take a look!

  • Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

      • What are Acute, Obtuse, and Right Triangles?What are Acute, Obtuse, and Right Triangles?

      What are Acute, Obtuse, and Right Triangles?

      Did you know that there are different kinds of triangles? Knowing how to identify these triangles is an important part of solving many problems involving these triangles. Check out this tutorial and learn about some of the different kinds of triangles!

  • Solve real-world and mathematical problems by writing and solving equations of the form x + p = q and px = q for cases in which p, q and x are all nonnegative rational numbers.

  • Draw polygons in the coordinate plane given coordinates for the vertices; use coordinates to find the length of a side joining points with the same first coordinate or the same second coordinate. Apply these techniques in the context of solving real-world and mathematical problems.

      • What is a Polygon?What is a Polygon?

      What is a Polygon?

      Got a closed figure with three or more sides? Then you have a polygon! In this tutorial, you'll learn about the properties of a polygon, see the names of the most popular polygons, and learn how to identify polygons. Check it out!

Further Exploration

  • Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

      • How Do You Classify Triangles?How Do You Classify Triangles?

      How Do You Classify Triangles?

      Being able to classify triangles is an important skill. If you know what kind of triangle you're looking at, it's much easier to figure out how to solve for various sides and angles. Practice classifying triangles with this tutorial!

  • Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.

      • How Do You Find a Missing Angle in a Triangle?How Do You Find a Missing Angle in a Triangle?

      How Do You Find a Missing Angle in a Triangle?

      Trying to find a missing interior angle measurement in a triangle? Already know the other two interior angle measurements? Then you're set! Just remember that the interior angles of a triangle ALWAYS add up to 180 degrees. This tutorial shows you how to put this knowledge into an equation and solve to find that missing measurement!

      • How Do You Find Missing Angles in an Isosceles Triangle?How Do You Find Missing Angles in an Isosceles Triangle?

      How Do You Find Missing Angles in an Isosceles Triangle?

      Trying to find a missing interior angle measurement in a triangle? See if you're working with a special type of triangle such as an equilateral or isosceles triangle. If you are, that knowledge can help you. In this tutorial, see how identifying your triangle first can be very helpful in solving for that missing measurement. Take a look!