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Why are obtuse angles always so grumpy?

Because they are never right.

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A4 portrait. It is drawn in vector form, so it also prints sharply scaled up to A3.

The poster

Cartoon maths joke poster. A smiling triangle asks: "Why are obtuse angles always so grumpy?" Punchline: "Because they are never right."
Maths joke poster: Why are obtuse angles always so grumpy?. CBSE Math Revision, free for classroom use.

Get it?

Get it? An obtuse angle is between 90° and 180°, so it can never be a right angle (exactly 90°).

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