Question

The three angles of a triangle are 54º, 57°
and 69º. Verify angle sum property for this
triangle.​

Answer 1

Step-by-step explanation:

sum of property of a triangle=$180^{0}$

now, we will add the angles that have been given us in the question and the sum of angles in left side

put $180^{0}$ in right side

$54^{0} +57^{0} +69^{0}=180^{0} \\ 111^{0} +69^{0} =180^{0} \\180^{0} =180^{0}$

hence proved the sum of property of this triangle

Hope it will help you

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