Practice - The Triangle Sum Theorem
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Practice Questions
Test your understanding with targeted questions
If angle A of triangle XYZ is 40° and angle B is 80°, what is angle C?
💡 Hint: Remember to sum the given angles and subtract from 180°.
Given triangle PQR, if angle P measures 50° and angle Q measures 70°, find the measure of angle R.
💡 Hint: Use the Triangle Sum Theorem.
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Interactive Quizzes
Quick quizzes to reinforce your learning
The sum of the angles in a triangle is always:
💡 Hint: Think about a triangle's shape and its angles.
True or False: The sum of the interior angles of a triangle is 90°.
💡 Hint: Recall the Triangle Sum Theorem.
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Challenge Problems
Push your limits with advanced challenges
In triangle JKL, angle J is three times greater than angle K and angle L measures 10°. Find the measure of angles J and K.
💡 Hint: Set up the equation using angle relationships.
A quadrilateral is formed by two triangles sharing one angle. Given the angles of one triangle are 40°, 60°, and x°, and the other triangle has two angles of 80° and 90°. Find x.
💡 Hint: Use both Triangle Sum Theorem and properties of quadrilateral angles.
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Reference links
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