The problem states that two angles of a triangle are $60^\circ$ and $72^\circ$. We need to find the angles formed by the altitudes of the triangle originating from the vertices of the given angles.

GeometryTrianglesAnglesAltitudesOrthocenter
2025/3/27

1. Problem Description

The problem states that two angles of a triangle are 6060^\circ and 7272^\circ. We need to find the angles formed by the altitudes of the triangle originating from the vertices of the given angles.

2. Solution Steps

Let the angles of the triangle be AA, BB, and CC. We are given A=60A = 60^\circ and B=72B = 72^\circ.
The sum of the angles in a triangle is 180180^\circ. Therefore,
A+B+C=180A + B + C = 180^\circ
60+72+C=18060^\circ + 72^\circ + C = 180^\circ
132+C=180132^\circ + C = 180^\circ
C=180132C = 180^\circ - 132^\circ
C=48C = 48^\circ
Let hAh_A, hBh_B, and hCh_C be the altitudes originating from vertices AA, BB, and CC respectively.
Let the angles formed by the altitudes hAh_A and hBh_B be α\alpha and β\beta. The point of intersection of the altitudes is the orthocenter.
The altitude from vertex AA is perpendicular to side BCBC, and the altitude from vertex BB is perpendicular to side ACAC. Therefore, the angle between hAh_A and hBh_B is supplementary to angle CC.
α=180C\alpha = 180^\circ - C
α=18048\alpha = 180^\circ - 48^\circ
α=132\alpha = 132^\circ
The other angle formed by hAh_A and hBh_B is
β=180α=180132=48\beta = 180^\circ - \alpha = 180^\circ - 132^\circ = 48^\circ
Since the altitudes from AA and BB are perpendicular to the sides opposite to AA and BB respectively, they form right angles.
Let the altitudes hAh_A and hBh_B intersect at HH. Consider the quadrilateral formed by vertices AA, BB, HH and the foot of the altitude from AA to BCBC, say DD and the foot of the altitude from BB to ACAC, say EE. The quadrilateral is CDHECDHE. The sum of angles in a quadrilateral is 360360^\circ. Thus, D+E+C+DHE=360\angle D + \angle E + \angle C + \angle DHE = 360^\circ. We have D=E=90\angle D = \angle E = 90^\circ and C=48\angle C = 48^\circ. So 90+90+48+DHE=36090^\circ + 90^\circ + 48^\circ + \angle DHE = 360^\circ, which implies 228+DHE=360228^\circ + \angle DHE = 360^\circ. Thus DHE=360228=132\angle DHE = 360^\circ - 228^\circ = 132^\circ. The angle formed is 132132^\circ, so the other angle is 180132=48180^\circ - 132^\circ = 48^\circ.
The angles formed by hAh_A and hCh_C are supplementary to angle BB.
180B=18072=108180^\circ - B = 180^\circ - 72^\circ = 108^\circ
The other angle is 7272^\circ.
The angles formed by hBh_B and hCh_C are supplementary to angle AA.
180A=18060=120180^\circ - A = 180^\circ - 60^\circ = 120^\circ
The other angle is 6060^\circ.

3. Final Answer

The angles formed by the altitudes originating from the vertices of the given angles are 132132^\circ and 4848^\circ. The other possible angles between the altitudes from vertices A and C are 108108^\circ and 7272^\circ. The other possible angles between the altitudes from vertices B and C are 120120^\circ and 6060^\circ. The problem asks for the angles formed by the altitudes originating from the vertices of the angles 6060^\circ and 7272^\circ, which is the angle at the orthocenter, 132132^\circ. The supplementary angle to C=48C = 48^\circ is 132132^\circ, thus the angle is 132132^\circ. Also, it can be 4848^\circ

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