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questiions andanswers

label Algebra
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1.

In a triangular cross section of a roof, the second angle is twice as large as the first.  The third angle is 20 degrees less than the first angle.  How large are the angles
Oct 6th, 2014

Take first angle = X 

Second angle is twice as large as first = 2X 

Third angle is 20 degrees lesser than first = X-20 

We know that sum of all angles of a triangle is 180 degrees . 

X+2X+(X-20) = 180 

X+2X+X-20=180

4X-20=180

4X=180+20=200

4X=200

X=200/4=50

First angle =50degrees

Second angle =2×50=100 degrees

Third angle = 20-X =20-50=-30 = 30 degrees 

Ignore negative sign 

( If you get Value higher change formula so that negative answer does not come that is make the formula 

X-20 ) . 


Oct 7th, 2014

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Oct 6th, 2014
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Oct 6th, 2014
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