Question

one angle of a triangle is 80* and the other two angles are in the ratio 1 : 3 then the larger angle is

Answer 1

Step-by-step explanation:

we know that the sum of all angles of a triangle is=180

since one angle is 80,then the other two angles be in the ratio of 1:3.

the sum of the two angles would be 180-80=100

now since the angles are in the ratio 1:3

<=x+3x=100

4x=100

x=25

then 3x=75

thus the larger angle is 75

Answer 2

Answer:

$80 + 1x + 3x = 180 \\ 4x + 80 = 180 \\ 4x = 180 - 80 \\ 4x = 100 \\ x = \frac{100 }{4 } \\ x = 25$

x = 25°

3x =3(25)°

=75

Step-by-step explanation:

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