GRADE 7 MATHEMATICS (7.6) Geometry and spatial reasoning. The student compares and classifies shapes and solids using geometric vocabulary and properties. The student is expected to: (B) use properties to classify triangles and quadrilaterals.
Name all the characteristics of a(n): Triangle Equilateral Triangle Isosceles Triangle Scalene Triangle Acute Triangle Right Triangle Obtuse Triangle
Sketch and label an isosceles obtuse triangle.
Sketch and label a scalene acute triangle.
1. What mathematical concepts and vocabulary do I need to know to be able to work this problem? 2. Will the Grade 7 Mathematics Formula Chart be helpful on this problem? Why or why not? 3. Will a picture or diagram be helpful on this problem? If so, how?
4. What problem-solving strategy or strategies will I use to help solve this problem?
5. Extension (7.9A): A scalene triangle has a base of 12 inches and a height of 8
2 inches. Find 3
its area. Show your work.
TEKSING TOWARD TAKS © 2006
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GRADE 7 MATHEMATICS (7.6) Geometry and spatial reasoning. The student compares and classifies shapes and solids using geometric vocabulary and properties. The student is expected to: (B) use properties to classify triangles and quadrilaterals.
Name all the characteristics of a(n): Triangle Equilateral Triangle Isosceles Triangle Scalene Triangle Acute Triangle Right Triangle Obtuse Triangle
Sketch and label an isosceles obtuse triangle.
Sketch and label a scalene acute triangle.
TEKSING TOWARD TAKS © 2006
Page 2
GRADE 7 MATHEMATICS (7.6) Geometry and spatial reasoning. The student compares and classifies shapes and solids using geometric vocabulary and properties. The student is expected to: (B) use properties to classify triangles and quadrilaterals.
Which statement is true about all right triangles? A
Two of the angles of the triangle will be acute angles.
B
One angle of the triangle will be obtuse.
C
The triangle cannot have two congruent sides.
D
The triangle will have two congruent angles.
Which of the following best describes triangle ABC with the given measures? B 116 o
C
A Which of the following can be the measures of two angles of a right triangle?
A
Scalene Acute Triangle
B
Isosceles Acute Triangle
A
35and 45
C
Isosceles Obtuse Triangle
65and 45
D
Isosceles Right Triangle
B C
35 and 65
D
35 and 55
Look at the triangles below.
Which statement is not true about all equilateral triangles? Triangle 1
Triangle 2
A
All three sides will measure the same.
B
Each angle of the triangle will measure 60.
Which triangle(s) are classified as scalene?
C
The triangle may have one obtuse angle.
A
Triangle 1 and Triangle 3
D
The sum of the measures of the angles will be 180.
B
Triangle 1 and Triangle 2
C
Triangle 3 only
D
Triangle 2 and Triangle 3
Triangle 3
Triangle ABC has angle measures of 60 , 80and 40. Triangle ABC is a(n) Which statement is not true about all isosceles triangles? A
Isosceles acute triangle
B
Scalene obtuse triangle
A
Two of the angles of the triangle will be acute angles.
C
Scalene acute triangle
B
The altitude to the base will bisect the base.
D
Scalene right triangle
C
The base angles are congruent.
D
The base will be longer than the legs.
TEKSING TOWARD TAKS © 2006
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