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We are given a cyclic quadrilateral with several angles. We need to find qq, rr, and ss.

  1. Identify angles subtended by the same arc.

    • ∠CAD=40∘\angle CAD = 40^\circ, so ∠CBD=40∘\angle CBD = 40^\circ (angles subtended by arc CD).
    • ∠ACB=60∘\angle ACB = 60^\circ, so ∠ADB=60∘\angle ADB = 60^\circ (angles subtended by arc AB).
    • ∠ABD=10∘\angle ABD = 10^\circ, so ∠ACD=10∘\angle ACD = 10^\circ (angles subtended by arc AD).
  2. Find qq.

    Let P be the intersection of the diagonals. qq is ∠APD\angle APD.
    In △APD\triangle APD:
    ∠PAD=∠CAD=40∘\angle PAD = \angle CAD = 40^\circ.
    ∠PDA=∠ADB=60∘\angle PDA = \angle ADB = 60^\circ.
    The sum of angles in a triangle is 180∘180^\circ.

    q=∠APD=180∘−(∠PAD+∠PDA)=180∘−(40∘+60∘)=180∘−100∘=80∘q = \angle APD = 180^\circ - (\angle PAD + \angle PDA) = 180^\circ - (40^\circ + 60^\circ) = 180^\circ - 100^\circ = 80^\circ
  3. Find rr.

    rr is ∠BCD\angle BCD.

    ∠BCD=∠BCA+∠ACD=60∘+10∘=70∘\angle BCD = \angle BCA + \angle ACD = 60^\circ + 10^\circ = 70^\circ
  4. Find ss.

    ss is ∠ADC\angle ADC. In a cyclic quadrilateral, opposite angles sum to 180∘180^\circ.
    First, find ∠ABC\angle ABC:

    ∠ABC=∠ABD+∠DBC=10∘+40∘=50∘\angle ABC = \angle ABD + \angle DBC = 10^\circ + 40^\circ = 50^\circ

    Now, find ss:

    s=∠ADC=180∘−∠ABC=180∘−50∘=130∘s = \angle ADC = 180^\circ - \angle ABC = 180^\circ - 50^\circ = 130^\circ

    The values are: q=80∘,r=70∘,s=130∘\boxed{q = 80^\circ, r = 70^\circ, s = 130^\circ}

    :
    We are given a circle with center O and a cyclic quadrilateral. We need to find gg and hh.

  5. Find hh.

    The angle 30∘30^\circ is ∠OQR\angle OQR. Since O is the center, OQ and OR are radii, making △OQR\triangle OQR an isosceles triangle.
    Therefore, ∠ORQ=∠OQR=30∘\angle ORQ = \angle OQR = 30^\circ.
    The sum of angles in △OQR\triangle OQR is 180∘180^\circ.

    h=∠QOR=180∘−(∠OQR+∠ORQ)=180∘−(30∘+30∘)=180∘−60∘=120∘h = \angle QOR = 180^\circ - (\angle OQR + \angle ORQ) = 180^\circ - (30^\circ + 30^\circ) = 180^\circ - 60^\circ = 120^\circ
  6. Find gg.

    gg is ∠QSR\angle QSR. This is an angle at the circumference subtended by arc QR.
    ∠QOR\angle QOR is the central angle subtended by the same arc QR.
    The angle at the circumference is half the angle at the center.

    g=∠QSR=12∠QOR=12×120∘=60∘g = \angle QSR = \frac{1}{2} \angle QOR = \frac{1}{2} \times 120^\circ = 60^\circ

    The 126∘126^\circ angle is ∠QPS\angle QPS, which is consistent with the other angles but not needed for finding gg and hh.
    The values are: g=60∘,h=120∘\boxed{g = 60^\circ, h = 120^\circ}

    :
    We are given a cyclic quadrilateral WXYZ with equal chords WX=XY=YZWX = XY = YZ. We need to find ∠WYX\angle WYX and ∠YWZ\angle YWZ.

  7. Determine the measure of the arcs.

    Given ∠WZY=42∘\angle WZY = 42^\circ. This angle subtends arc WXY.
    The measure of the arc is twice the angle at the circumference.

    arc WXY=2×∠WZY=2×42∘=84∘\text{arc WXY} = 2 \times \angle WZY = 2 \times 42^\circ = 84^\circ

    Since chords WX=XY=YZWX = XY = YZ are equal, the arcs they subtend are also equal.
    Let arc WX=arc XY=arc YZ=xarc\text{arc WX} = \text{arc XY} = \text{arc YZ} = x_{arc}.
    Then arc WXY=arc WX+arc XY=xarc+xarc=2xarc\text{arc WXY} = \text{arc WX} + \text{arc XY} = x_{arc} + x_{arc} = 2x_{arc}.

    2xarc=84∘  ⟹  xarc=42∘2x_{arc} = 84^\circ \implies x_{arc} = 42^\circ

    So, arc WX=42∘\text{arc WX} = 42^\circ, arc XY=42∘\text{arc XY} = 42^\circ, and arc YZ=42∘\text{arc YZ} = 42^\circ.

  8. Find ∠WYX\angle WYX.

    ∠WYX\angle WYX subtends arc WX.

    ∠WYX=12×arc WX=12×42∘=21∘\angle WYX = \frac{1}{2} \times \text{arc WX} = \frac{1}{2} \times 42^\circ = 21^\circ
  9. Find ∠YWZ\angle YWZ.

    ∠YWZ\angle YWZ subtends arc YZ.

    ∠YWZ=12×arc YZ=12×42∘=21∘\angle YWZ = \frac{1}{2} \times \text{arc YZ} = \frac{1}{2} \times 42^\circ = 21^\circ

    The values are: i) ∠WYX=21∘,ii) ∠YWZ=21∘\boxed{\text{i) } \angle WYX = 21^\circ, \text{ii) } \angle YWZ = 21^\circ}

    :
    We are given a cyclic quadrilateral ABCD with equal chords AB=BC=CDAB = BC = CD. We need to find ∠ACD\angle ACD and ∠ADC\angle ADC.

  10. Relate angles using equal chords.

    Since chords AB=BC=CDAB = BC = CD are equal, they subtend equal angles at the circumference.
    Let ∠ADB=∠BDC=∠CAD=α\angle ADB = \angle BDC = \angle CAD = \alpha.
    Also, ∠BCA\angle BCA subtends arc AB, so ∠BCA=α\angle BCA = \alpha.
    And ∠CBD\angle CBD subtends arc CD, so ∠CBD=α\angle CBD = \alpha.

  11. Find α\alpha in terms of pp.

    Given ∠BCD=p∘\angle BCD = p^\circ.
    We know ∠BCD=∠BCA+∠ACD\angle BCD = \angle BCA + \angle ACD.
    Also, consider △BCD\triangle BCD. The angles are ∠CBD\angle CBD, ∠BDC\angle BDC, and ∠BCD\angle BCD.

    ∠CBD+∠BDC+∠BCD=180∘\angle CBD + \angle BDC + \angle BCD = 180^\circ α+α+p∘=180∘\alpha + \alpha + p^\circ = 180^\circ 2α+p∘=180∘2\alpha + p^\circ = 180^\circ α=180∘−p∘2=90∘−p∘2\alpha = \frac{180^\circ - p^\circ}{2} = 90^\circ - \frac{p^\circ}{2}
  12. Find ∠ACD\angle ACD.

    We know ∠BCD=∠BCA+∠ACD\angle BCD = \angle BCA + \angle ACD.

    p∘=α+∠ACDp^\circ = \alpha + \angle ACD ∠ACD=p∘−α\angle ACD = p^\circ - \alpha

    Substitute the expression for α\alpha:

    ∠ACD=p∘−(90∘−p∘2)=p∘−90∘+p∘2=2p∘+p∘2−90∘=3p∘2−90∘\angle ACD = p^\circ - \left(90^\circ - \frac{p^\circ}{2}\right) = p^\circ - 90^\circ + \frac{p^\circ}{2} = \frac{2p^\circ + p^\circ}{2} - 90^\circ = \frac{3p^\circ}{2} - 90^\circ
  13. Find ∠ADC\angle ADC.

    ∠ADC\angle ADC subtends arc ABC.
    Arc ABC = arc AB + arc BC.
    The angle subtended by arc AB at the circumference is α\alpha. So arc AB=2α\text{arc AB} = 2\alpha.
    The angle subtended by arc BC at the circumference is α\alpha. So arc BC=2α\text{arc BC} = 2\alpha.
    Thus, arc ABC=2α+2α=4α\text{arc ABC} = 2\alpha + 2\alpha = 4\alpha.
    The angle at the circumference subtended by arc ABC is ∠ADC\angle ADC.

    ∠ADC=12×arc ABC=12(4α)=2α\angle ADC = \frac{1}{2} \times \text{arc ABC} = \frac{1}{2} (4\alpha) = 2\alpha

    Substitute the expression for α\alpha:

    ∠ADC=2(90∘−p∘2)=180∘−p∘\angle ADC = 2\left(90^\circ - \frac{p^\circ}{2}\right) = 180^\circ - p^\circ

    The values are: i) ∠ACD=3p∘2−90∘,ii) ∠ADC=180∘−p∘\boxed{\text{i) } \angle ACD = \frac{3p^\circ}{2} - 90^\circ, \text{ii) } \angle ADC = 180^\circ - p^\circ}

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