ANGLES
TRIANGLES
TESSELLATIONS
TRANSFORMATIONS
Dr.
Doo Riddles
100

An angle that is less than 90 degrees.

What is an acute angle?

100

A triangle with one angle measuring 90 degrees.

What is a right triangle?

100

A pattern of shapes that fit together without any gaps or overlaps.

What is a tessellation?

100
If you fold a shape along this line, both halves will match perfectly.

What is a line of symmetry?

100

I’m a place where knowledge grows,
Where you learn, and friendships flow.
Books, pencils, desks, and pens,
I’m where the learning never ends.
You come to me to grow and play—
What place do you visit every day?

What is a school?

200

90 degrees

What does a right angle measure?

200

A triangle with two equal sides and two equal angles.

What is an isosceles triangle?

200

A polygon will tessellate when the sum of the interior angles around a shared vertex measures this.

What is 360 degrees?

200

A shape shows reflectional symmetry when folded across this horizontal axis.

What is the x-axis?

200

I have a point but never speak,
I help you write, though I am sleek.
I start with sharpness, dull with time,
And in your hand, I help you rhyme.
I leave my mark on paper bright—
What am I, with lead so light?

What is a pencil?

300

180 degrees in relation to a triangle

What is the sum of the interior angles of a triangle?

300

A triangle with all equal sides and all equal angles.

What is an equilateral triangle?

300

This polygon tessellates because each of its interior angles measure 90 degrees.

What is a square?

300

A shape shows reflectional symmetry when folded across this vertical axis.

What is the y-axis?

300

I wander through the forest wide,
With fur as thick and strong as pride.
In winter's cold, I rest and hide,
But when I wake, I roam with stride.
My roar shakes trees, my paws leave marks,
Yet I seek the quiet in the dark.
A creature wild, both calm and fierce—
What am I, who loves the woods to pierce?

What is a bear?

400

An angle that measures more than 90 degrees but less than 180 degrees.

What is an obtuse angle?

400

This is the measurement of the sum of the interior angles of any triangle.

What is 180 degrees?

400

This triangle tessellates and two of the interior angles of the triangle measures 70 degrees and the other angle measures 40 degrees.

What is an isosceles triangle?

400

Turning a shape around a fixed point.

What is rotation?

400

I travel in steps, unseen yet true,
From sky to earth, then back anew.
I rise as mist, then fall as rain,
To flow in streams, then rise again.
I dance in loops, a constant flow—
What am I, where all things grow?

What is the water cycle?

500

This angle is comprised of two angles that add together to make 90 degrees. HINT: The two angles COMPLETE each other to make a square corner and has the word ending -ary.

What is a complementary angle?

500

An isosceles triangle is missing a measurement for two identical angles. The measurement of the third angle is 50 degrees.

What is 65 degrees?

500

A triangle has a missing measurement for one of its angles. The supplemental angle for this is 120 degrees.

What is 60 degrees?

500

Moving a shape from one place to another WITHOUT rotating or flipping it.

What is translation?

500

I rise and fall, with no set pace,
A place where numbers change in space.
I hold the promise of gain or loss,
And fortunes shift at any cost.
You buy and sell, and take a chance—
What am I, where wealth can dance?

What is the stock market?