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題目

解題步驟

1. Understand the question

   angles in a triangle and solving for missing angles
   fill in the missing definitions.
   by side
   equilateral triangles -
   isosceles triangles
   scalene triangles
   by angle
   has three angles < 90°
   has one angle = 90°
   has one angle > 90°

2. Brief Explanations

   Each definition is based on the standard classification of triangles by side length and angle measure. For side-based categories, definitions relate to the number of equal sides; for angle-based, they relate to angle size thresholds.

3. Final answer

   By Side

   1. Equilateral Triangles - has all three sides equal
   2. Isosceles Triangles - has exactly two sides equal
   3. Scalene Triangles - has no sides equal

   By Angle

   1. has three angles < 90° - Acute Triangle
   2. has one angle = 90° - Right Triangle
   3. has one angle > 90° - Obtuse Triangle

答案

Question Analysis

OCR Text

angles in a triangle and solving for missing angles
fill in the missing definitions.
by side
equilateral triangles -
isosceles triangles
scalene triangles
by angle
has three angles < 90°
has one angle = 90°
has one angle > 90°

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