Area of rectangle - Area of triangle small

مرسلة بواسطة DBD Badie Mousa Ragye في

 





4/a=5/b

ab=4*5 =20un²


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Area of rectangle is 4×5 =20

Area of triangle small is 4×4÷2=8

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X=180-(80+20)=180-100= 80°
The sum of two opposite interior angles =1 exterior angle (x+40°=160°
X=80°

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