Triangle Angles and Back Solving

The video tutorial introduces the concept of back solving in geometry, particularly for problems involving triangles. It explains when back solving can be applied, provides an example problem, and walks through the solution step-by-step. Key facts about triangles, such as the sum of interior angles, are highlighted. The tutorial concludes by encouraging viewers to practice with available problems.

What is the main focus of back solving in this lesson?

• Solving geometry questions

• Solving algebraic equations

• Solving physics problems

• Solving calculus problems

When can back solving be applied to geometry problems?

• When there is a single drawing and a missing variable

• When the problem is algebraic

• When there are multiple variables

• When there are no drawings

What is the value of x in the example problem?

• 20°

• 25°

• 35°

• 70°

What is the sum of the interior angles of a triangle?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

What does the little box in a triangle indicate?

• A right angle

• An acute angle

• A straight angle

• An obtuse angle

If x is 35°, what is the value of 2x?

• 105°

• 70°

• 140°

• 35°

What is the value of y if 70 + 90 + y = 180?

• 20

• 10

• 30

• 40

What is the first step in back solving a geometry problem?

• Use a calculator

• Guess the answer

• Label the answer choices

• Draw the figure

What should you remember about the little box in a triangle?

• It indicates a right angle

• It indicates a straight angle

• It indicates an obtuse angle

• It indicates an acute angle

What is the angle marked 4y if y = 20?

• 100°

• 60°

• 80°

• 40°