Comprehensive Triangle Classification and Analysis Quiz

Which of the following describes a right triangle?

• A triangle with all acute angles
• A triangle with one 90° angle
• A triangle with one obtuse angle
• A triangle with all angles equal

In an isosceles triangle, what can be said about its sides?

• All sides are equal
• Two sides are equal
• No sides are equal
• The longest side is twice the shortest side

Given the coordinates (1,1), (4,5), and (7,1), what is the most likely classification of this triangle?

• Right
• Obtuse
• Acute
• Equilateral

In a triangle with angles 2x, 3x, and 5x, what is the value of x?

• 15°
• 18°
• 20°
• 22.5°

What is the sum of the measures of the interior angles of any triangle?

• 90°
• 180°
• 270°
• 360°

In a triangle, an exterior angle measures 120°. What is the sum of the two non-adjacent interior angles?

• 60°
• 90°
• 120°
• 240°

In an isosceles triangle, if one of the base angles is 42°, what is the measure of the vertex angle?

• 42°
• 84°
• 96°
• 138°

What is the measure of each interior angle in an equilateral triangle?

• 30°
• 45°
• 60°
• 90°

Where is the base of the isosceles triangle?

• Always on the bottom

• Opposite the legs

• The shortest side

• The longest side