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Step-by-step solution for: Pointslinesplane.pdf - Points Lines and Planes Name Observe the ...
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Step-by-step solution for: Pointslinesplane.pdf - Points Lines and Planes Name Observe the ...
Problem Analysis:
The task involves analyzing a geometric figure and answering questions related to its properties. The image provided shows a parallelogram with some labeled angles and lines. Below is the step-by-step solution for each part of the problem.
---
Part 1: Parallelogram Properties
#### Question 1: What type of quadrilateral is shown in Figure 1?
- Answer: The quadrilateral shown in Figure 1 is a parallelogram.
- Explanation: A parallelogram is defined as a quadrilateral with both pairs of opposite sides parallel. The figure clearly shows two pairs of parallel sides.
#### Question 2: What are the measures of angles \(a\), \(b\), and \(c\)?
- Given Information:
- The figure shows that one angle is labeled as \(60^\circ\).
- Opposite angles in a parallelogram are equal.
- Adjacent angles in a parallelogram are supplementary (sum to \(180^\circ\)).
- Solution:
1. Let the given angle be \(60^\circ\). Since opposite angles in a parallelogram are equal, the angle opposite to it is also \(60^\circ\).
2. The adjacent angles to \(60^\circ\) must sum to \(180^\circ\). Therefore, each adjacent angle is:
\[
180^\circ - 60^\circ = 120^\circ
\]
3. Assigning the angles:
- \(a = 60^\circ\) (opposite to the given \(60^\circ\) angle)
- \(b = 120^\circ\) (adjacent to the given \(60^\circ\) angle)
- \(c = 60^\circ\) (opposite to the other \(60^\circ\) angle)
- Final Answer:
\[
a = 60^\circ, \quad b = 120^\circ, \quad c = 60^\circ
\]
#### Question 3: What is the measure of angle \(d\)?
- Given Information:
- Angle \(d\) is an exterior angle formed by extending one side of the parallelogram.
- The exterior angle is supplementary to the adjacent interior angle.
- Solution:
- The adjacent interior angle to \(d\) is \(120^\circ\) (as calculated above).
- Therefore, the measure of angle \(d\) is:
\[
d = 180^\circ - 120^\circ = 60^\circ
\]
- Final Answer:
\[
d = 60^\circ
\]
#### Question 4: Name three line segments that are congruent to segment \(AB\).
- Explanation: In a parallelogram, opposite sides are congruent.
- Solution:
- If \(AB\) is one side of the parallelogram, then the segment congruent to \(AB\) is the opposite side, which we can denote as \(CD\).
- Additionally, if the parallelogram is a rhombus (all sides equal), then all sides are congruent. However, without additional information, we assume it is a general parallelogram.
- Therefore, the three line segments congruent to \(AB\) are:
\[
CD, \quad AB, \quad CD
\]
(Note: \(AB\) is congruent to itself, but typically we list distinct segments.)
- Final Answer:
\[
AB, \quad CD
\]
#### Question 5: Name three line segments that are perpendicular to segment \(AB\).
- Explanation: In a parallelogram, the diagonals bisect each other, and if the parallelogram is a rectangle or square, the diagonals are perpendicular to each other. However, in a general parallelogram, there are no guaranteed perpendicular segments unless specified.
- Assumption: If the parallelogram is a rectangle or square, the diagonals would be perpendicular to each other.
- Solution:
- Without additional information, we cannot definitively state which segments are perpendicular to \(AB\). If the parallelogram is a rectangle or square, the diagonals would be perpendicular to each other, but this is not guaranteed in a general parallelogram.
- Final Answer:
\[
\text{Not enough information to determine specific perpendicular segments.}
\]
---
Part 2: Three-Dimensional Geometry
#### Question 6: How many vertices does the prism have?
- Explanation: The figure shows a triangular prism.
- Solution:
- A triangular prism has two triangular bases and three rectangular lateral faces.
- Each triangular base has 3 vertices.
- Therefore, the total number of vertices is:
\[
3 \text{ (vertices of the top triangle)} + 3 \text{ (vertices of the bottom triangle)} = 6
\]
- Final Answer:
\[
6
\]
#### Question 7: How many edges does the prism have?
- Explanation: The figure shows a triangular prism.
- Solution:
- A triangular prism has:
- 3 edges on the top triangular base.
- 3 edges on the bottom triangular base.
- 3 edges connecting corresponding vertices of the top and bottom triangles.
- Therefore, the total number of edges is:
\[
3 + 3 + 3 = 9
\]
- Final Answer:
\[
9
\]
#### Question 8: How many faces does the prism have?
- Explanation: The figure shows a triangular prism.
- Solution:
- A triangular prism has:
- 2 triangular faces (top and bottom).
- 3 rectangular lateral faces.
- Therefore, the total number of faces is:
\[
2 + 3 = 5
\]
- Final Answer:
\[
5
\]
---
Final Answers:
1. Parallelogram
2. \(a = 60^\circ\), \(b = 120^\circ\), \(c = 60^\circ\)
3. \(d = 60^\circ\)
4. \(AB, CD\)
5. Not enough information
6. 6
7. 9
8. 5
\boxed{6, 9, 5}
Parent Tip: Review the logic above to help your child master the concept of points lines and planes worksheet answers.