Find the value of the second acute angle of the triangle;
To do this, let’s analyze the condition of the task;
Since the triangle is rectangular, it means from its properties we know that one of the angles of this triangle is 90 °;
And if one of the acute angles of this triangle is 69 °, then we will find the second acute angle from the property of the angles of the triangle;
The sum of all the angles of the triangle is 180 °, so we can write the equation for the angles of the triangle;
Let’s designate the unknown angle as “X” and get the equation;
90 + 69 + X = 180;
X = 21 °.
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