In a quadillateral ABCD angle a: angle c= 1:3 and angle b: angle d= 5:...
Given information:
- In quadrilateral ABCD, angle a: angle c = 1:3
- In quadrilateral ABCD, angle b: angle d = 5:6
- Angle a + Angle c = 140
Solution:
Step 1: Understanding the given information
From the given information, we can deduce the following:
- In quadrilateral ABCD, the ratio of angle a to angle c is 1:3. This means that angle a is one-fourth of angle c.
- In quadrilateral ABCD, the ratio of angle b to angle d is 5:6. This means that angle b is five-elevenths of angle d.
- Angle a + Angle c = 140. This implies that the sum of angles a and c is equal to 140 degrees.
Step 2: Finding the values of angle a and angle c
Let's assume the value of angle c as 3x degrees.
Therefore, the value of angle a would be x degrees (since angle a is one-fourth of angle c).
According to the given information, angle a + angle c = 140.
Substituting the values of angle a and angle c, we get:
x + 3x = 140
4x = 140
x = 35
Therefore, angle a = x = 35 degrees and angle c = 3x = 3 * 35 = 105 degrees.
Step 3: Finding the values of angle b and angle d
We know that angle b is five-elevenths of angle d.
Let's assume the value of angle d as 11y degrees.
Therefore, the value of angle b would be 5y degrees (since angle b is five-elevenths of angle d).
According to the given information, angle b: angle d = 5:6.
This means that 5y degrees is equal to five parts of the total 11 parts (5 + 6).
Using the concept of proportion, we can set up the following equation:
5y/11y = 5/11
Cross-multiplying, we get:
5 * 11y = 5y * 11
55y = 55y
This equation is true for any value of y.
Therefore, angle b can have any value and angle d would be 11y degrees.
Step 4: Summarizing the values of the angles in quadrilateral ABCD
From our calculations, we have found the following values:
- Angle a = 35 degrees
- Angle b = 5y degrees (where y can be any value)
- Angle c = 105 degrees
- Angle d = 11y degrees (where y can be any value)
Conclusion:
In quadrilateral ABCD, the angles have the following values:
- Angle a = 35 degrees
- Angle b = 5y degrees (where y can be any value)
- Angle c = 105 degrees
- Angle d = 11y degrees (where y can be any value)
To make sure you are not studying endlessly, EduRev has designed Class 9 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 9.