We are given a circle with two intersecting chords, $\overline{PR}$ and $\overline{LQ}$. We are given that $m\angle L = 50^\circ$ and $m\angle R = 56^\circ$. We want to find $m\angle 1$, where $\angle 1$ is formed by the intersection of the two chords.

GeometryCirclesChordsAnglesInscribed AnglesVertical AnglesExterior Angle Theorem
2025/5/9

1. Problem Description

We are given a circle with two intersecting chords, PR\overline{PR} and LQ\overline{LQ}. We are given that mL=50m\angle L = 50^\circ and mR=56m\angle R = 56^\circ. We want to find m1m\angle 1, where 1\angle 1 is formed by the intersection of the two chords.

2. Solution Steps

We can find the measure of angle 1 using the following formula:
m1=12(mLR^+mPQ^)m\angle 1 = \frac{1}{2} (m\widehat{LR} + m\widehat{PQ})
Since mLm\angle L is an inscribed angle that intercepts arc QR^\widehat{QR}, mQR^=2mL=250=100m\widehat{QR} = 2 \cdot m\angle L = 2 \cdot 50^\circ = 100^\circ.
Since mRm\angle R is an inscribed angle that intercepts arc PQ^\widehat{PQ}, mPQ^=2mR=256=112m\widehat{PQ} = 2 \cdot m\angle R = 2 \cdot 56^\circ = 112^\circ.
m1=12(mLR^+mPQ^)m\angle 1 = \frac{1}{2} (m\widehat{LR} + m\widehat{PQ})
Also 1\angle 1 and PLQ\angle PLQ are vertical angles, so the arcs can be mLR^m\widehat{LR} and mPQ^m\widehat{PQ}
mLQR=mR=56m\angle LQR = m\angle R = 56^{\circ}, because both are inscribed angles that intercept arc LQ^\widehat{LQ}.
m1=12(mPQ^+mLR^)=12(2mR+2mL)=mR+mLm\angle 1 = \frac{1}{2}(m\widehat{PQ} + m\widehat{LR}) = \frac{1}{2}(2 \cdot m\angle R + 2 \cdot m\angle L) = m\angle R + m\angle L.
m1=56+50=106m\angle 1 = 56^\circ + 50^\circ = 106^\circ.
Another approach: Since 1\angle 1 is an exterior angle of PRL\triangle PRL, its measure is equal to the sum of the measures of the two non-adjacent interior angles. Thus, m1=mL+mR=50+56=106m\angle 1 = m\angle L + m\angle R = 50^\circ + 56^\circ = 106^\circ.

3. Final Answer

106

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