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HIPPOPOTENUSE postcard by Sandra Boynton

4.9 out of 5 stars rating
15895 Total Reviews |
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Paper Type
Signature Matte
18 pt thickness / 120 lb weight Soft white, soft eggshell texture
-$0.16
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About Postcards

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Size: Standard Postcard

Create your own vacation-worthy postcard! Any view you’ve seen, any monument you’ve fallen in love with, can all be added to your postcard with our personalization tool.

  • Dimensions: 5.6" L x 4.25" H; qualified USPS postcard size
  • High quality, full-color, full-bleed printing on both sides

Paper Type: Signature Matte

Our Signature Matte paper is a customer favorite—smooth to the touch with a soft eggshell texture that elevates any design. Its sturdy 18 pt weight and natural feel make it the ideal choice for timeless, sophisticated events.

  • Exclusively made for Zazzle
  • Made and Printed in the USA
  • FSC® Certified—sourced from responsibly managed forests that protect both people and planet

About This Design

HIPPOPOTENUSE postcard by Sandra Boynton

HIPPOPOTENUSE postcard by Sandra Boynton

This helpful geometry diagram shows the parts of a right triangle: the adjacent, the opposite, and the…wait. What? (A classic Boynton design from 1980, which she redrew in 2013.)
Sandra Boynton
Gold
Artwork designed by
The wilds of New England, United States
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Customer Reviews

4.9 out of 5 stars rating15.9K Total Reviews
14452 total 5-star reviews1012 total 4-star reviews212 total 3-star reviews81 total 2-star reviews138 total 1-star reviews
15,895 Reviews
5.0 out of 5 stars rating
5 out of 5 stars rating
By Dawne C.January 7, 2022 • Verified Purchase
Post Card, Size: Standard Postcard, Paper: Signature Matte, Envelopes: None
Zazzle Reviewer Program
Of course, Sandra Boynton pictures are always fun. Looking forward to sending some “happy mail” to my math teacher friend. This card is printed well, good colors & spacing.
Reviews for similar products
5.0 out of 5 stars rating
5 out of 5 stars rating
By Ray A.September 30, 2025 • Verified Purchase
Post Card, Size: Standard Postcard, Paper: Signature Matte, Envelopes: None
Very pleased with my order. All my prints were manufactured to a very high standard to my exact specifications and edited additions.
5.0 out of 5 stars rating
5 out of 5 stars rating
By Paul I.February 4, 2021 • Verified Purchase
Post Card, Size: Standard Postcard, Paper: Signature Matte, Envelopes: None
Creator Review
I had never seen these classic science fiction images and most of my friends have not seen them either. They are like little treasures! Amazing quality and fun to send people!

Tags

Postcards
sandra boyntoncartoonhippomathgeometrytrianglehippopotenusehippotenusehypotenuseboynton
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sandra boyntoncartoonhippomathgeometrytrianglehippopotenusehippotenusehypotenuseboynton

Other Info

Product ID: 239628743349812397
Created on: 11/27/2013, 7:18 PM
Rating: G 
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