Question

1. practice: organizing information

complete the chart. write acute, obtuse, or right in each blank.
sorting triangles by angle measures
____triangle __triangle ____triangle
has all ____angles (less than 90°) has one __angle (90°) has one ____angle (greater than 90°)
(images of triangles with angle measures: 40°, 60°, 80°; 27°, 60°, 83°; 120°, 30°, 30°)

1. practice: organizing information

complete the chart and venn diagram. write equilateral, isosceles, or scalene in each blank.
sorting triangles by side lengths
____triangle __triangle ____triangle

Explanation:

Step1: Recall Triangle Angle Classifications

Acute triangles have all angles < 90°, right triangles have one 90° angle, obtuse triangles have one angle > 90°.

Step2: Analyze First Triangle

Angles: 40°, 80°, 60° (all < 90°) → Acute triangle.

Step3: Analyze Second Triangle

Angle: 90° (right angle) → Right triangle.

Step4: Analyze Third Triangle

Angle: 120° (> 90°) → Obtuse triangle.

Step5: Fill Chart Headers

First column: Acute (all angles < 90°), Second: Right (one 90°), Third: Obtuse (one > 90°).

For Side Lengths (Problem 9):

Step1: Recall Triangle Side Classifications

Equilateral: all sides equal, Isosceles: at least two sides equal, Scalene: all sides different.

Step2: Chart Headers

First: Equilateral, Second: Isosceles, Third: Scalene.

Answer:

(Problem 8):

Sorting Triangles by Angle Measures
Has all acute angles (< 90°)	Has one right angle (90°)	Has one obtuse angle (> 90°)
(Triangle with 40°, 80°, 60°)	(Triangle with 90°)	(Triangle with 120°)