In Fig. 10.32, `l` and `m` are two parallel tangents at `A` and `B` . The tangent at `C` makes an intercept `D E` between `l` and `m` . Prove that `/_D F E=90o` .

In Figure, n and m are two parallel tangents at A and B . The tangent at C makes an intercept D E between n and m . Prove that /_D F E=90^@ .

In Fig.10.32,l and m are two parallel tangents at A and B. The tangent at C makes an intercept DE between l and m. Prove that /_DFE=90o.

In fig. l and m are two parallel tangents at A and B. The tangent at C makes an intercept DE between l and m. Find angle DFE .

In a circle, PQ and RS are two parallel tangents at A and B. The tangent at makes an intercept DE between PQ and RS. Then angle DOE is equal to : (where O is centre).

In Fig.10.13 , and and are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting contact C intersecting at B.Prove that /_AOB=90^(@)

In Fig, 10.13, XY and X'Y' are two parallel tangents to a circle with centre O and another tangent AR with point of contact C intersecting XY at A and X'Y' at B. Prove that angle AOB=90^@ .

In Fig.10.13, XYandX'Y' are two parallel tangent to a circle with centre O and another tangent AB with point of contact C intersecting XY at A and X'Y' at B.Prove that angleAOB=90^@ .

In Fig XY and X'Y' are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting XY and X'Y' at B , prove that angle AOB = 90^@

l and m are two parallel tangents to a circle with centre O, touching the circle at A and B respectively. Another tangent at C intersects the line l at D and m at E. Prove that /_DOE=90^@.

l and m are two parallel tangents to a circle with centre O,touching the circle at A and B respectively.Another tangent at C intersects the line l at D and m at E.Prove that /_DOE=90^(@).