Question

the ratio of the angles of a triangle is 3:4:5.the threeangles of a quatrilateral

Answer 1

hey dear!
we know the angle sum property of a triangle that all its angle add up to 180°.
now let the angles of the triangles be 3x,4x,5x.
now,3x+4x+5x=180
12x=180°
x=15°.
now 1st angle=3×15=45°
2nd angle=4×15=60°
3rd angle=5×15=75°
now if these r the angles of quadrilateral too then, 45°+75°+60°+x=360°
x=180°.
hope it helps✌

Answer 2

By angle sum property :

3x + 4x + 5x = 180

12x = 180

x = 180 / 12

x = 15

3x = 3 × 15 = 45

4x = 4 × 15 = 60

5x = 5 × 15 = 75

Hope it helps you.