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Triangle Detective: The Secret Angles Case

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Triangle Detective: The Secret Angles Case

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About this activity

You are a detective on a mission! Solve the mystery by answering questions about triangle properties. Each correct answer will help you unlock new clues.

Created by

Angie Orozco
Angie Orozco
Colombia

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Triangle Detective: The Secret Angles Case
 

Triangle Detective: The Secret Angles CaseOnline version

You are a detective on a mission! Solve the mystery by answering questions about triangle properties. Each correct answer will help you unlock new clues.

by Angie Orozco
1

A hidden message says: What is the sum of the interior angles of a triangle? A. 90° B. 180° C. 360° D. 270°

Hints

It is more than 90° but less than 360°.

A triangle always has three interior angles.

If you open a triangle and rearrange its angles, they can form a straight shape.

This total is always the same, no matter the size or type of triangle.

2

Which triangle has all sides equal? A. Scalene B. Isosceles C. Equilateral D. Right

Hints

All sides have the same length.

All angles are also equal.

Each angle measures the same value.

Its name starts with the letter “E”.

3

Which triangle has two equal sides? A. Scalene B. Isosceles C. Equilateral D. Right

Hints

This triangle has two equal sides, but not all three.

It is not completely equal like the previous triangle.

Two of its angles are also equal.

Its name starts with the letter “I”.

4

At the crime scene, one angle forms a perfect square corner… Which triangle has a 90° angle? A. Acute B. Obtuse C. Right triangle D. Scalene

Hints

One of its angles measures exactly 90 degrees.

This angle looks like the corner of a square or a book.

It forms an “L” shape.

Its name includes the word “right”.

5

The final clue says: “All my angles are smaller than a right angle” Which triangle has all angles less than 90°? A. Right B. Obtuse C. Acute D. Isosceles

Hints

All its angles are less than 90°.

It does NOT have a right angle.

It does NOT have an angle greater than 90°.

 
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