The angels of the triangle are 3x - 40 , x + 20 and 2x - 10 . find the value of x .
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using angle sum property of triangle is 180⁰
3x - 40 + x + 20 + 2x - 10 = 180⁰
6x - 30 = 180⁰
6x = 180⁰+30⁰
6x = 210⁰
x = 210⁰÷6
x = 35⁰
angles are , 3×35-40 = 105-40 = 65⁰
35+20 = 55⁰
2×35-10 = 70-10 = 60⁰
angles of triangle are 65⁰,55⁰,60⁰
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