A circle is inscribed in an isosceles trapezoid. What is the acute angle of a trapezoid if the point of tangency
September 30, 2021 | education
| A circle is inscribed in an isosceles trapezoid. What is the acute angle of a trapezoid if the point of tangency divides the lateral side into segments, the length ratio of which is 3: 1?
Let the length of the segment BM = X cm, then the length of the segment AM = 3 * X cm.
By the property of a tangent drawn from one point, the segment BP = BM = X cm, the segment AM = AK = 3 * X cm.
Let’s draw the height BH, then the quadrangle BPKH is a rectangle, and HK = BP = X cm.
Then AH = AK – HK = 3 * X – X = 2 * X cm.
In a right-angled triangle ABH, we determine the value of the angle BAH.
AB = AM + BM = 3 * X + X = 4 * X.
CosBAH = AH / AB = 2 * X / 4 * X = 1/2.
Angle BAH = arcos (1/2) = 60.
Answer: The acute angle of the trapezoid is 60.
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