Marge
@m4rgem.bsky.social
Reposted by Marge
A fun geometry puzzle
January 17, 2026 at 4:51 PM
A fun geometry puzzle
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Why is the interior angle sum of an n-gon (n-2)×180°?
January 14, 2026 at 5:18 PM
Why is the interior angle sum of an n-gon (n-2)×180°?
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Here's a fun puzzle: What is the sum of the 5 angles of a 5-pointed star?
December 27, 2025 at 3:48 PM
Here's a fun puzzle: What is the sum of the 5 angles of a 5-pointed star?
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In a recent video, I showed that in a 3-4-5 right triangle, the radius of the inscribed circle is 1.
We can generalize this: in an a-b-c right triangle, the radius of the inscribed circle is (a+b-c)/2. Here's how we know this:
We can generalize this: in an a-b-c right triangle, the radius of the inscribed circle is (a+b-c)/2. Here's how we know this:
January 1, 2026 at 4:29 PM
In a recent video, I showed that in a 3-4-5 right triangle, the radius of the inscribed circle is 1.
We can generalize this: in an a-b-c right triangle, the radius of the inscribed circle is (a+b-c)/2. Here's how we know this:
We can generalize this: in an a-b-c right triangle, the radius of the inscribed circle is (a+b-c)/2. Here's how we know this:
Reposted by Marge
One of the coolest math facts that I know is that the only circle that fits perfectly in a 3-4-5 right triangle has an area of pi.
Here's how we can prove this.
Here's how we can prove this.
December 18, 2025 at 8:30 PM
One of the coolest math facts that I know is that the only circle that fits perfectly in a 3-4-5 right triangle has an area of pi.
Here's how we can prove this.
Here's how we can prove this.
Reposted by Marge
"When will I ever use this?" "How is this useful in my life?"
Not everything we learn in math has to be applied. Math can be seen as an art as well.
Not everything we learn in math has to be applied. Math can be seen as an art as well.
December 16, 2025 at 8:48 PM
"When will I ever use this?" "How is this useful in my life?"
Not everything we learn in math has to be applied. Math can be seen as an art as well.
Not everything we learn in math has to be applied. Math can be seen as an art as well.
Reposted by Marge
How can we tell if a function has a hole or a vertical asymptote?
December 14, 2025 at 4:37 PM
How can we tell if a function has a hole or a vertical asymptote?
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Did you know all prime numbers (besides 2 and 3) are all one away from a multiple of 6? Here's how we can show this.
December 6, 2025 at 5:10 PM
Did you know all prime numbers (besides 2 and 3) are all one away from a multiple of 6? Here's how we can show this.
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How many positive factors does 20²⁵ have?
December 4, 2025 at 4:12 PM
How many positive factors does 20²⁵ have?
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Reposted by Marge
ln|x|??? How did you get in there? 😱
December 4, 2025 at 1:26 AM
ln|x|??? How did you get in there? 😱
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Happy Thanksgiving! How many different ways can 6 people sit at a table?
November 27, 2025 at 3:08 PM
Happy Thanksgiving! How many different ways can 6 people sit at a table?
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Can you find the three fastest rats in the fewest number of races?
November 22, 2025 at 3:07 PM
Can you find the three fastest rats in the fewest number of races?
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I was wrong a couple times in my last video. Today I learned that "minus" is a preposition and NOT a verb.
It makes sense though, like "I like your outfit, minus the shoes."
It makes sense though, like "I like your outfit, minus the shoes."
November 20, 2025 at 7:49 PM
I was wrong a couple times in my last video. Today I learned that "minus" is a preposition and NOT a verb.
It makes sense though, like "I like your outfit, minus the shoes."
It makes sense though, like "I like your outfit, minus the shoes."
Reposted by Marge
- and - mean different things, and if we understand that one is a verb and the other is an adjective, we can better understand integer subtraction
November 19, 2025 at 8:42 PM
- and - mean different things, and if we understand that one is a verb and the other is an adjective, we can better understand integer subtraction
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Don't make this mistake when subtracting
November 18, 2025 at 7:06 PM
Don't make this mistake when subtracting
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Why can't we divide by 0?
November 8, 2025 at 2:39 PM
Why can't we divide by 0?
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Given that it’s Halloween, here are some haiku horrorscopes.
October 31, 2025 at 10:31 AM
Given that it’s Halloween, here are some haiku horrorscopes.
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This math problem divides the audience in whether the answer is 1/6 or 1/11
October 22, 2025 at 7:52 PM
This math problem divides the audience in whether the answer is 1/6 or 1/11
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Is the 6" or 7" slice of pizza the better deal?
October 11, 2025 at 2:20 PM
Is the 6" or 7" slice of pizza the better deal?
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TODAY'S THE DAY! It's one of the coolest dates of our lifetime.
Whether you go by month/day/year or day/month/year, if we write the date as one number, we will get a square number! Both sides can agree that today's date is a square date.
9,272,025=3045²
27,092,025=5205²
Whether you go by month/day/year or day/month/year, if we write the date as one number, we will get a square number! Both sides can agree that today's date is a square date.
9,272,025=3045²
27,092,025=5205²
September 27, 2025 at 7:11 AM
TODAY'S THE DAY! It's one of the coolest dates of our lifetime.
Whether you go by month/day/year or day/month/year, if we write the date as one number, we will get a square number! Both sides can agree that today's date is a square date.
9,272,025=3045²
27,092,025=5205²
Whether you go by month/day/year or day/month/year, if we write the date as one number, we will get a square number! Both sides can agree that today's date is a square date.
9,272,025=3045²
27,092,025=5205²
Reposted by Marge
Drawing can help make polynomial division easier!
September 19, 2025 at 9:34 PM
Drawing can help make polynomial division easier!
Reposted by Marge
Create a number where the sum of the digits is a multiple of 9. It is guaranteed that the number you created is a multiple of 9. Here's why this will always work:
September 17, 2025 at 9:43 PM
Create a number where the sum of the digits is a multiple of 9. It is guaranteed that the number you created is a multiple of 9. Here's why this will always work:
Reposted by Marge
Happy 3²/4²/5² ! Here's a cool fact about a 3-4-5 right triangle: The circle that fits perfectly in a 3-4-5 right triangle has an area of pi square units! Here's why.
September 16, 2025 at 2:33 PM
Happy 3²/4²/5² ! Here's a cool fact about a 3-4-5 right triangle: The circle that fits perfectly in a 3-4-5 right triangle has an area of pi square units! Here's why.