Geometry lesson 30
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Transcript of Geometry lesson 30
![Page 1: Geometry lesson 30](https://reader035.fdocuments.net/reader035/viewer/2022081502/587d29641a28ab1c2f8b72b7/html5/thumbnails/1.jpg)
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ABC = ACB, ABC is an isosceles triangle. CAB = 180 - 80 - 80 = 20 , DAB is an isosceles triangle. BEC = 180 - 80 - 50 = 50 , BEC is an isosceles triangle. BFE = 180 - 20 - 50 = 110 , (angle property of a triangle).
DFC = 110 , (vertically opposite angles).
FDC = 180 - 110 - 30 = 40 , (angle property of a triangle).
EFD = 180 - 110 = 70 , (angle at a straight line).
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ABC = ACB, ABC is an isosceles triangle. CAB = 180 - 80 - 80 = 20 .
BEC = 180 - 80 - 60 = 40 .
BFE = 180 - 10 - 40 = 130 , (angle property of a triangle).
DFC = 130 , (vertically opposite angles).
FDC = 180 - 130 - 20 = 30 , (angle property of a triangle).
EFD = 180 - 130 = 50 , (angle at a straight line).
![Page 4: Geometry lesson 30](https://reader035.fdocuments.net/reader035/viewer/2022081502/587d29641a28ab1c2f8b72b7/html5/thumbnails/4.jpg)
ABC = ACB, ABC is an isosceles triangle. CAB = 180 - 80 - 80 = 20 .
BEC = 180 - 80 - 40 = 60 .
BFE = 180 - 40 - 60 = 80 , (angle property of a triangle).
DFC = 80 , (vertically opposite angles).
FDC = 180 - 80 - 40 = 60 , (angle property of a triangle).
EFD = 180 - 60 = 100 , (angle at a straight line).
The value of x could not be obtained in all the questions due to insufficient information.
![Page 5: Geometry lesson 30](https://reader035.fdocuments.net/reader035/viewer/2022081502/587d29641a28ab1c2f8b72b7/html5/thumbnails/5.jpg)
Find the value of x in each figure
![Page 6: Geometry lesson 30](https://reader035.fdocuments.net/reader035/viewer/2022081502/587d29641a28ab1c2f8b72b7/html5/thumbnails/6.jpg)
Find the value of x in each figure
![Page 7: Geometry lesson 30](https://reader035.fdocuments.net/reader035/viewer/2022081502/587d29641a28ab1c2f8b72b7/html5/thumbnails/7.jpg)
Find the value of x in each figure
![Page 8: Geometry lesson 30](https://reader035.fdocuments.net/reader035/viewer/2022081502/587d29641a28ab1c2f8b72b7/html5/thumbnails/8.jpg)
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Find the value of x in each figure.
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Find the value of x in each of the figure.
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Find the value of x for the below figure
![Page 13: Geometry lesson 30](https://reader035.fdocuments.net/reader035/viewer/2022081502/587d29641a28ab1c2f8b72b7/html5/thumbnails/13.jpg)
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