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ABCD is a trapezium in which AB || CD and AD = BC (see Fig. 8.23). Show that (i) ∠ A = ∠ B (ii) ∠ C = ∠ D (iii) ∆ ABC ≅ ∆ BAD (iv) diagonal AC = diagonal BD [Hint : Extend AB and draw a line through C parallel to DA intersecting AB produced at E.]

ABCD is a trapezium in which AB || CD and AD = BC (see Fig. 8.23). Show that (i) ∠ A = ∠ B (ii) ∠ C = ∠ D (iii) ∆ ABC ≅ ∆ BAD (iv) diagonal AC = diagonal BD [Hint : Extend AB and draw a line through C parallel to DA intersecting AB produced at E.]  Solution: Have a look at this image.  
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In ∆ ABC and ∆ DEF, AB = DE, AB || DE, BC = EF and BC || EF. Vertices A, B and C are joined to vertices D, E and F respectively (see Fig. 8.22). Show that (i) quadrilateral ABED is a parallelogram (ii) quadrilateral BEFC is a parallelogram (iii) AD || CF and AD = CF (iv) quadrilateral ACFD is a parallelogram (v) AC = DF (vi) ∆ ABC ≅ ∆ DEF.

In ∆ ABC and ∆ DEF, AB = DE, AB || DE, BC = EF and BC || EF. Vertices A, B and C are joined to vertices D, E and F respectively (see Fig. 8.22). Show that (i) quadrilateral ABED is a parallelogram (ii) quadrilateral BEFC is a parallelogram (iii) AD || CF and AD = CF (iv) quadrilateral ACFD is a parallelogram (v) AC = DF (vi) ∆ ABC ≅ ∆ DEF. Solution: Have a look at this image.  
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ABCD is a parallelogram and AP and CQ are perpendiculars from vertices A and C on diagonal BD (see Fig. 8.21). Show that (i) ∆ APB ≅ ∆ CQD (ii) AP = CQ

ABCD is a parallelogram and AP and CQ are perpendiculars from vertices A and C on diagonal BD (see Fig. 8.21). Show that (i) ∆ APB ≅ ∆ CQD (ii) AP = CQ Solution: Have a look at this image.  
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In parallelogram ABCD, two points P and Q are taken on diagonal BD such that DP = BQ (see Fig. 8.20). Show that: (i) ∆ APD ≅ ∆ CQB (ii) AP = CQ (iii) ∆ AQB ≅∆ CPD (iv) AQ = CP (v) APCQ is a parallelogram

 In parallelogram ABCD, two points P and Q are taken on diagonal BD such that DP = BQ (see Fig. 8.20). Show that: (i) ∆ APD ≅ ∆ CQB (ii) AP = CQ (iii) ∆ AQB ≅∆ CPD (iv) AQ = CP (v) APCQ is a parallelogram Solution: Have a look at this image.
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ABCD is a rectangle in which diagonal AC bisects ∠ A as well as ∠ C. Show that: (i) ABCD is a square (ii) diagonal BD bisects ∠ B as well as ∠ D.

ABCD is a rectangle in which diagonal AC bisects ∠ A as well as ∠ C. Show that: (i) ABCD is a square (ii) diagonal BD bisects ∠ B as well as ∠ D.  Solution: Have a look at this image.  
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ABCD is a rhombus. Show that diagonal AC bisects ∠ A as well as ∠ C and diagonal BD bisects ∠ B as well as ∠ D.

 ABCD is a rhombus. Show that diagonal AC bisects ∠ A as well as ∠ C and diagonal BD bisects ∠ B as well as ∠ D. Solution: Have a look at this image.
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Diagonal AC of a parallelogram ABCD bisects ∠ A (see Fig. 8.19). Show that (i) it bisects ∠ C also, (ii) ABCD is a rhombus.

Diagonal AC of a parallelogram ABCD bisects ∠ A (see Fig. 8.19). Show that (i) it bisects ∠ C also, (ii) ABCD is a rhombus. Solution: Have a look at this image.  
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Show that if the diagonals of a quadrilateral are equal and bisect each other at right angles, then it is a square.

 Show that if the diagonals of a quadrilateral are equal and bisect each other at right angles, then it is a square. Solution: Have a look at this image.
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Show that the diagonals of a square are equal and bisect each other at right angles.

 Show that the diagonals of a square are equal and bisect each other at right angles. Solution: Have a look at this image.
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Show that if the diagonals of a quadrilateral bisect each other at right angles, then it is a rhombus.

 Show that if the diagonals of a quadrilateral bisect each other at right angles, then it is a rhombus. Solution: Have a look at this image.
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If the diagonals of a parallelogram are equal, then show that it is a rectangle.

 If the diagonals of a parallelogram are equal, then show that it is a rectangle. Solution: Have a look at this image.
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The angles of quadrilateral are in the ratio 3 : 5 : 9 : 13. Find all the angles of the quadrilateral.

The angles of quadrilateral are in the ratio 3 : 5 : 9 : 13. Find all the angles of the quadrilateral. Solution: Have a look at this image.  
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Digestive System Extra Questions

 Digestive System Extra Questions   1. Digestion is the breakdown of naturally occurring foodstuffs into ......... form. View Solution 2. An enzyme is a ........ . View Solution 3. An enzyme gets destroyed by ......... . View Solution 4. An enzyme acts on a specific type of substance called ........ . View Solution 5. The degree of acidity or alkalinity of a solution is measured in terms of .......... . View Solution 6. Enzymes act best within a particular range of temperature called ............ temperature, which is usually between .....°C and ......°C. View Solution 7. The digestive system consists of the ............ and the ............ . View Solution 8. The alimentary canal starts with the ......... and ends at the ........ . View Solution 9. The ............ glands are associated with the oral cavity. View ...
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