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In ∆DEF, ∠D = 60°, ∠E = 70° and the bise...

In `∆DEF, ∠D = 60°, ∠E = 70°` and the bisectors of` ∠E and ∠F` meet at O. Find (i) `∠F` (ii)` ∠EOF`.

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NCERT EXEMPLAR-TRIANGLES-EXERCISE TRUE OR FALSE
  1. If one angle of a triangle is 60° and the other two angles are in the ...

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  2. In ∆PQR, if 3∠P = 4∠Q = 6∠R, calculate the angles of the triangle.

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  3. In ∆DEF, ∠D = 60°, ∠E = 70° and the bisectors of ∠E and ∠F meet at O. ...

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  4. In Fig. 6.41, ∆PQR is right-angled at P. U and T are the points on lin...

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  5. In Fig. 6.44, if RP = RQ, find the value of x.

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  6. In Fig. 6.45, if ST = SU, then find the values of x and y.

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  7. Check whether the following measures (in cm) can be the sides of a rig...

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  8. Height of a pole is 8 m. Find the length of rope tied with its top fro...

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  9. In Fig. 6.46, if y is five times x, find the value of z.

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  10. The lengths of two sides of an isosceles triangle are 9 cm and 20 cm. ...

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  11. Without drawing the triangles write all six pairs of equal measures in...

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  12. ABC is an isosceles triangle with AB = AC and D is the mid-point of ba...

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  13. In Figure, it is given that LM = ON and NL = MO (a) State the three ...

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  14. Triangles DEF and LMN are both isosceles with DE = DF and LM = LN, res...

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  15. If ∆PQR and ∆SQR are both isosceles triangle on a common base QR such ...

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  16. State which of the following pairs of triangles are congruent. If yes...

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  17. State which of the following pairs of triangles are congruent. If yes...

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  18. In Figure, PQ = PS and ∠ 1 = ∠ 2. (i) Is ∆PQR ≅ ∆PSR? Give reaso...

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  19. In Figure, ∠1 = ∠ 2 and ∠ 3 = ∠ 4 . (i) Is ∆ADC ≅ ∆ ABC? Why ? ...

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  20. Observe Figure and state the three pairs of equal parts in triangles A...

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