Square Diagonal Analysis: Identifying Triangle Types in a Square ABCD

Triangle Classification with Diagonal Intersections

Look at the square below:

AAABBBDDDCCC

What types of triangles do the diagonals in the square form?

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Look at the square below:

AAABBBDDDCCC

What types of triangles do the diagonals in the square form?

2

Step-by-step solution

The diagonals of the square intersect each other, so the four triangles are isosceles. Moreover, since the diagonals are perpendicular to each other, the diagonals form four right-angled triangles. Therefore, the correct answers are A+C

3

Final Answer

Answers (a) and (c) are correct.

Key Points to Remember

Essential concepts to master this topic
  • Properties: Square diagonals are perpendicular and bisect each other
  • Analysis: Four triangles have two equal sides and 90° angles
  • Check: All triangles are both right-angled AND isosceles ✓

Common Mistakes

Avoid these frequent errors
  • Choosing only one triangle type instead of both
    Don't pick just right-angled OR just isosceles = missing half the answer! Each triangle has BOTH properties simultaneously. Always identify ALL triangle classifications that apply to the same triangles.

Practice Quiz

Test your knowledge with interactive questions

Is a square a trapezoid?

FAQ

Everything you need to know about this question

How can a triangle be both right-angled AND isosceles at the same time?

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A triangle can have multiple classifications! When square diagonals intersect, they create triangles with two equal sides (isosceles) and one 90° angle (right-angled). These properties don't conflict - they describe different features of the same triangle.

Why are the diagonals of a square perpendicular?

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In a square, diagonals always meet at 90° angles because of the square's symmetry. This perpendicular intersection is what creates the right angles in each of the four triangles formed.

How do I know the triangles are isosceles?

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Each triangle has two sides that are equal - they're both half the length of a diagonal. Since the diagonals bisect each other, the two segments from the center to any two vertices of the square are equal lengths.

Are all four triangles exactly the same?

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Yes! All four triangles are congruent - they have the same size and shape. Each one is both right-angled and isosceles with the same measurements.

What if I only see right angles and miss the equal sides?

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Look carefully at the diagonal segments! From where the diagonals cross to each vertex of the square, you'll see that two sides of each triangle are equal - that's what makes them isosceles.

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