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If one angle of a triangle is equal to t...

If one angle of a triangle is equal to the sum of the other two angles, the triangle is

A

obtuse

B

acute

C

right

D

equilateral

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NCERT EXEMPLAR-TRIANGLES-EXERCISE CHOOSE THE CORRECT ONE
  1. In Fig. 6.12, PQ = PR, RS = RQ and ST || QR. If the exterior angle RPU...

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  2. In Fig. 6.13, ∠BAC = 90°, AD ⊥ BC and ∠BAD = 50°, then ∠ACD is

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  3. If one angle of a triangle is equal to the sum of the other two angles...

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  4. If the exterior angle of a triangle is 130° and its interior opposite...

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  5. If one of the angles of a triangle is 110°, then the angle between the...

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  6. In ∆ABC, AD is the bisector of ∠A meeting BC at D, CF ⊥ AB and E is th...

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  7. In ∆PQR, if ∠ P = 60°, and ∠ Q = 40°, then the exterior angle formed b...

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  8. Which of the following triplets cannot be the angles of a triangle?

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  9. Which of the following can be the length of the third side of a triang...

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  10. How many altitudes does a triangle have?

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  11. If we join a vertex to a point on opposite side which divides that sid...

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  12. The measures of angle x and angle y in Fig.6.14 are respectively

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  13. If length of two sides of a triangle are 6 cm and 10 cm, then the leng...

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  14. In a right-angled triangle ABC, if angle B = 90°, BC = 3 cm and AC = 5...

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  15. In a right-angled triangle ABC, if angle B = 90°, then which of the f...

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  16. Which of the following figures will have it’s altitude outside the tri...

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  17. In Fig.6.16 IF AB||CD, then

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  18. In A B C ,/A=100^0 ,A D\ b i s e c t s\ /A\ a n d\ A D|B Cdotfin d\ /...

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  19. In ∆ABC, ∠Α = 50°, ∠B = 70° and bisector of ∠C meets AB in D (Fig. 6....

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  20. If for ∆ABC and ∆DEF, the correspondence CAB ↔ EDF gives a congruence,...

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