CBSE IX TRIANGLES

In two triangles DEF and PQR, if DE = QR, EF = PR and FD = PQ, then

• ∆DEF ≅ ∆PQR

• ∆FED ≅ ∆PRQ

• ∆EDF ≅ ∆RPQ

• ∆PQR ≅ ∆EFD

In ∆ABC, BC = AB and ∠B = 80°. Then ∠A is equal to:

• 80^o

• 40^o

• 50^o

• 100^o

Two sides of a triangle are of length 5 cm and 1.5 cm. The length of the third side of the triangle cannot be:

• 3.6 cm

• 4.1 cm

• 3.8 cm

• 6.9 cm

In ∆PQR, if ∠R > ∠Q, then

• QR > PR

• PQ > PR

• PQ < PR

• QR < PR

In the given figure, if the exterior angle is 135^o then ∠P is:

• 45^o

• 60^o

• 80^o

• 90^o

It is given that Δ ABC ≅ Δ FDE and AB = 5 cm, ∠B = 40° and ∠A = 80°. Then which of the following is true?

• DF = 5 cm, ∠F = 60°

• DF = 5 cm, ∠E = 60°

• DE = 5 cm, ∠E = 60°

• DE = 5 cm, ∠D = 40°

In triangles ABC and DEF, AB = FD and ∠A = ∠D. The two triangles will be congruent by SAS axiom if:

• BC = EF

• AC = DE

• AC = EF

• BC = DE

In triangle ABC, AB = AC and angle A : angle B = 8 : 5 , find angle A .

• $10^0$
  

• $20^o$

• $70^o$

• $80^o$

• $\Delta EFC$

• $\Delta ECF$

• $\Delta DEF$

• $\Delta FEC$

In triangles ABC and PQR, AB = AC, ∠C = ∠P and ∠B = ∠Q. The two triangles are:

• Isosceles but not congruent

• Isosceles and congruent

• Congruent but not isosceles

• Neither congruent nor isosceles