4.MD.C.6

The Secret Door: Whispering Compass

Experience Awakening - Our open-world educational game

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Game Info for Teachers

COMBINED RATING

3.8 Stars

TEACHERS (16)

4.1

STUDENTS (6316)

3.5

LENGTH

13 Minutes

GRADES

CAPABILITIES

iPad Support

Spanish Language Support

Text-to-Speech Support

Description

Locals say a group of pirates hide their treasure behind secret doors and only left modified compasses as the clue to open it. A regular compass will always point to the north and the south but not these compasses. The pirates have modified it into some kind of puzzle. Martha, an innkeeper who wants to be a treasure hunter has figured out the way to unlock the door by forming correct angles on the compasses. But to unlock all doors, she needs your help!

Vocabulary Words

protractor

compass

rays

vertex

one-degree angle

acute angle

obtuse angle

straight angle

Instructions

Play through this interactive game to learn about Measure Angles Using A Protractor. Suitable for Grade 3, Grade 4, Grade 5.

Main Concepts

An angle that turns through 1/360 of a circle is called a “one-degree angle,” and degrees are the unit used to measure angles.

Angles are measured with reference to a circle with its center at the common endpoint of the rays and the rays intersection points in relation to their fraction of the circular arc.

In an angle each ray determines a direction and the angle size measures the change from one direction to the other.

Using a protractor accurately sketch an angle with a given angle measurement.

When measuring an angle the center point should align with the center point of the protractor, and one arm or ray should align with the base of the protractor. The other arm will determine the angle measure in relation to the first ray.

Measure angles using a protractor.

Estimate angle measures.

Discussion Questions

Before the Game

What do we call the sides of an angle? What is the point that connects the two sides of an angle called? What tool do we use to measure angles? What unit do we use to express the size of an angle?

After the Game

Why was it important to point one of the rays at the zero mark on the protractor before placing the second ray on the correct angle measurement? How did this game show you how to use an actual protractor? What were the types of angles that were illustrated in the game? What clues did you use in the last level to help you decide if the angle measurement was correct or incorrect?