Prove that the sum of angles of a triangle is two right angles .if angles of a triangle are the ratio 3:4:5, find the smallest angle .
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Let the ratios be x
3x,4x,5x
Two right angles=180'
3x+4x+5x=180'
12x=180'
x=180/12
X=15'
1st angle
3x=3x15
=45
2nd angle
4x=4X15
=60
3rd angle
5x=5X15
=75
3x,4x,5x
Two right angles=180'
3x+4x+5x=180'
12x=180'
x=180/12
X=15'
1st angle
3x=3x15
=45
2nd angle
4x=4X15
=60
3rd angle
5x=5X15
=75
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