Buzz
1. Solving math problems on pages 140 and 141 of textbook exercise 1
Solution method:
- A rhombus is a parallelogram with all sides equal or a parallelogram with two diagonals perpendicular to each other is a rhombus.
- A rectangle is a quadrilateral with four right angles or a parallelogram with two diagonals of equal length is a rectangle.
Answer:
Figure 1 and Figure 3 are rhombuses.
Which figure is a rectangle?
Additionally: Figures 2, 4, and 5 are not rhombuses because they do not have four equal sides.
Figures 1, 3, and 4 are not rectangles because they do not have right angles.
Figure 5 is not a rectangle because it lacks four right angles.
2. Solving math problems for grade 4 on pages 140 and 141 of the textbook, exercise 2
Solution method:
- Use a protractor to check if the two diagonals are perpendicular.
- Note: A rhombus has two diagonals perpendicular to each other, intersecting at the midpoint of each diagonal.
Answer:
a) Upon inspection, it is evident that the two diagonals are perpendicular.
b) The two diagonals intersect at the midpoint of each diagonal because upon checking, we find:
OA = OC = 3cm; OB = OD = 2cm.
3. Solving grade 4 rhombus problems on pages 140 and 141, exercise 3
Problem:
Practice folding and cutting paper (according to the drawing) to create a rhombus.
Solution method:
Students observe the illustration and follow the paper-folding steps as demonstrated.
Answer:
Students carefully examine the drawing to understand the exercise and practice according to the illustration.
Short guide to solving grade 4 math problems on pages 140,141
* Solve exercise 1 math problem on pages 140, 141 in the textbook
Problem::
Among the following shapes:
- Which shape is a rhombus?
- Which shape is a rectangle?
Answer:
Figures 1 and 3 are rhombuses.
Figure 2 is a rectangle.
Additionally: Figures 2, 4, and 5 are not rhombuses because they do not have four equal sides.
Figures 1, 3, and 4 are not rectangles because they lack right angles.
Figure 5 is not a rectangle because it doesn't have four right angles.
* Solve exercise 2 math problem for grade 4 on page 141 in the textbook
Problem::
In rhombus ABCD, AC and BD are two diagonals intersecting at point O.
a) Use a protractor to check if the two diagonals are perpendicular?
b) Use a ruler with centimeter markings to check if the two diagonals intersect at the midpoint of each diagonal?
Answer:
a) The two diagonals are perpendicular.
b) The two diagonals intersect at the midpoint of each diagonal because in that case, we observe:
OA=OC= 3 cm
OB= OD= 2cm.
Observation: A rhombus has two diagonals perpendicular to each other, intersecting at the midpoint of each diagonal.
* Solve grade 4 math problem on rhombuses on pages 140, 141
Problem::
Practice folding and cutting paper (according to the drawing) to create a rhombus.
Answer:
Fold and cut the paper (according to the diagram) to create a diamond shape.
Students should follow the instructions.
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In this journey, we have collectively explored the answers and problem-solving methods for 4th-grade math on pages 140 and 141, focusing on the rhombus. We hope the information in this article proves helpful for the 4th-grade math learning process. Moving forward, to excel in 4th-grade math, refer to the section Solving Math Problems Grade 4 pages 142, 143 to understand and apply solving problems related to the rhombus. Alternatively, review the knowledge about parallelograms in the section solving math problems Grade 4 pages 102, 103 edited and compiled by Mytour before.
