The acute triangle portion, with all angles less than 90 degrees, is inert.
所有角度都小于 90 度的锐角三角形部分是惰性的。
TED-Ed(视频版)
Similar experiments show that all shapes other than acute triangles, including right triangles, will also wake up.
类似的实验表明, 除了锐角三角形之外的所有形状,包括直角三角形, 也会被唤醒。
TED-Ed(视频版)
How can you cut the blob entirely into acute triangles and stop it from destroying the planet?
你怎么能把这个团块完全切成锐角三角形并阻止它毁灭地球呢?
英语百科
Acute and obtuse triangles
(重定向自Acute Triangle)
An acute triangle is a triangle with all three angles acute (less than 90°). An obtuse triangle is one with one obtuse angle (greater than 90°) and two acute angles. Since a triangle's angles must sum to 180°, no triangle can have more than one obtuse angle.