We are given a circle with center $T$. $NL$ and $MK$ are diameters of the circle. We are given that $\angle NTJ = 88^\circ$, $\angle JTK = 44^\circ$, and $\angle KTL = 48^\circ$. We need to identify whether arc $MNL$ is a major arc, a minor arc, or a semicircle, and find its measure.

GeometryCirclesAnglesArcsDiametersCentral AngleMajor Arc
2025/4/28

1. Problem Description

We are given a circle with center TT. NLNL and MKMK are diameters of the circle. We are given that NTJ=88\angle NTJ = 88^\circ, JTK=44\angle JTK = 44^\circ, and KTL=48\angle KTL = 48^\circ. We need to identify whether arc MNLMNL is a major arc, a minor arc, or a semicircle, and find its measure.

2. Solution Steps

First, let's find the measure of NTL\angle NTL. Since NLNL is a diameter, NTL=180\angle NTL = 180^\circ.
Since NTK+KTL=NTL\angle NTK + \angle KTL = \angle NTL, we have NTK+48=180\angle NTK + 48^\circ = 180^\circ.
Thus, NTK=18048=132\angle NTK = 180^\circ - 48^\circ = 132^\circ.
Also, NTK=NTJ+JTK=88+44=132\angle NTK = \angle NTJ + \angle JTK = 88^\circ + 44^\circ = 132^\circ. This confirms the given information.
Since MKMK is a diameter, MTK=180\angle MTK = 180^\circ. We have MTK=MTN+NTJ+JTK\angle MTK = \angle MTN + \angle NTJ + \angle JTK. Also, MTN+NTJ+JTK=180\angle MTN + \angle NTJ + \angle JTK = 180^\circ.
We know that NTJ=88\angle NTJ = 88^\circ and JTK=44\angle JTK = 44^\circ, so MTN+88+44=180\angle MTN + 88^\circ + 44^\circ = 180^\circ.
MTN=1808844=180132=48\angle MTN = 180^\circ - 88^\circ - 44^\circ = 180^\circ - 132^\circ = 48^\circ.
Now we want to find the measure of arc MNLMNL, which corresponds to the central angle MTL\angle MTL.
We have MTL=MTN+NTK+KTL\angle MTL = \angle MTN + \angle NTK + \angle KTL, or MTL=MTN+NTL\angle MTL = \angle MTN + \angle NTL. Since NTL=180\angle NTL = 180^\circ,
MTL=48+180=228\angle MTL = 48^\circ + 180^\circ = 228^\circ.
Since 228>180228^\circ > 180^\circ, the arc MNLMNL is a major arc.
The measure of arc MNLMNL is equal to the measure of MTL\angle MTL, which is 228228^\circ.

3. Final Answer

Major arc
228

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