Ncert -Maths -Triangles-Set A Welcome to your Ncert -Maths -Triangles-Set A 1. Tick the correct answer and justify:Sides of two similar triangles are in the ratio 4:9. Areas of these triangles are in the ratio : 16:81 2:3 81:16 4:9 None 2. Three circular laminas of the same radius are cut out from a larger circular lamina. When the radius of each lamina cut out is the largest possible, then what is the ratio (approximate) of the area of the residual piece of the original lamina to its original total area? 0.40 0.35 0.30 0.45 None 3. If one angle of a triangle is equal to the sum of the other two angles then the triangle is: Isosceles triangle Obtuse angled triangle Right-angled triangle Equilateral triangle None 4. If straight line is drawn parallel to one side of a triangle then it divides the other two sides proportionally is called. converse of thales theorem Corollary of thales Pythagoras theorem thales theorem None 5. In △ABC, given below, AB=8cm, BC=10 cm and AC=6 cm. If a point P lies on AB and Q on AC such that PQ || BC and PQ=5 cm, then find AP. 5cm 3cm 2cm 4cm None 6. In ΔABC, if D and E are mid points of BC and AD respectively such that ar(AEC)=4cm² then ar(BEC)= 6cm² 8cm² 12cm² 4cm² None 7. If △ABC∼△DEF and DE=8cm,AB=10cm then the Ratio of ar(△ABC) to ar(△DEF)= 16:25 4:5 5:4 25:16 None 8. Area of similar triangles are proportional to all the above squares on their corresponding sides squares on their corresponding medians squares on their corresponding altitude None 9. △ABC and △PQR are two similar triangles whose areas are 100cm² and144cm² and height of △ABC is 6cm² then height of △PQR will be: 6.3 cm 7.2 cm 4 8 cm 12 cm None 10. Area of similar triangles are in the ratio 25:36 then ratio of their similar sides is _________? 6:7 6:5 5:6 5:7 None 11. ABC and BDE are two equilateral triangles such that D is the mid point of BC. Ratio of the areas of triangle ABC and BDE is 1:2 4:1 1:4 2:1 None 12. The corresponding altitudes of two similar triangles are 9cm and 15cm respectively then the ratio between their areas. 9:15 100:25 3:15 81:225 None 13. The area of two similar triangles are 16 cm² 36 cm² respectively, If the altitudes are in the ratio 2:x, then the value of x is 2 3 4 6 None 14. If straight-line divides two sides of a triangle proportionally then the straight line is parallel to the third side is called thales theorem pythogoral theorem converse of Pythagoras theorem converse of thales theorem None 15. ABCD is parallelogram and P is the mid point of the side AD. The line BP meets the diagonal AC in Q. Find the ratio AQ :QC. 1:3 1:2 2:1 3:1 None 16. Ram goes √12.5 km towards west from a certain point. Then after turning to his right he again goes same distance. In the end he goes 25km towards South-East. How far is he now from his starting point? 20km 5km 10km 15km None 17. Triangles ABC and DEF are similar. If their areas are 64 cm² and 49 cm² and if AB is 7 cm, then find the value of DE. 49/8 cm 8/49 cm 8cm 64/7 cm None 18. In △ABC and △DEF if AB/DE = BC/FD then they will be similar if: ∠B=∠E ∠A =∠D ∠A =∠F ∠B=∠D None 19. Two trees 7m and 4m high stand upright on a ground. If their bases (roots) are 4m apart, then the distance between their tops is 6m 5m 11m 3m None 20. In △ABC if AB=5 cm, BC=12 cm and AC=13 cm, then ∠B will be: 60º 90º 45º 120º None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
