41.In figure, l || m, show that ∠1 + ∠2 - ∠3 = 180°.
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42.In figure, AB || CD and CD || EF. Also EA ⊥ AB. If ∠BEF = 40°, then find x, y, z.
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43.In the figure below, l1 || l2 and a1 || a2. Find the value of x.
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Long Answer Type
44.Two parallel lines are intersected by a transversal. Then, prove that the bisectors of two pairs of interior angles enclose a rectangle.
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Short Answer Type
45.In the figure, if PQ || RS, ∠MXQ = 135° and ∠MYR = 40°, find ∠XMY.
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46.If a transversal intersects two lines such that the bisectors of a pair of corresponding angles are parallel, then prove that the two lines are parallel.
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47.In the figure, AB || CD and CD || EF. Also EA ⊥ AB. If ∠BEF = 55°, find the values of x, y and z.
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48.In figure, if AB || CD then find the value of x.
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49.AB and CD are the bisectors of the two alternate interior angles formed by the intersection of a transversal 't' with parallel lines l and m. Show that AB || CD.
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50. In figure, l || m. ∠1 and ∠2 are in the ratio 5 : 4. Find ∠3 and ∠4.